1234005421 has 4 divisors (see below), whose sum is σ = 1346187744. Its totient is φ = 1121823100.

The previous prime is 1234005391. The next prime is 1234005449. The reversal of 1234005421 is 1245004321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1245004321 = 11 ⋅113182211.

It is a cyclic number.

It is not a de Polignac number, because 1234005421 - 2⁹ = 1234004909 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1234005392 and 1234005401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234005481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56091145 + ... + 56091166.

It is an arithmetic number, because the mean of its divisors is an integer number (336546936).

Almost surely, 2^1234005421 is an apocalyptic number.

1234005421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1234005421 is a deficient number, since it is larger than the sum of its proper divisors (112182323).

1234005421 is a wasteful number, since it uses less digits than its factorization.

1234005421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112182322.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1234005421 is about 35128.4133003471. The cubic root of 1234005421 is about 1072.6030375375.

Adding to 1234005421 its reverse (1245004321), we get a palindrome (2479009742).

It can be divided in two parts, 123400 and 5421, that added together give a palindrome (128821).

The spelling of 1234005421 in words is "one billion, two hundred thirty-four million, five thousand, four hundred twenty-one".