1234120421 has 4 divisors (see below), whose sum is σ = 1237677312. Its totient is φ = 1230563532.

The previous prime is 1234120417. The next prime is 1234120439. The reversal of 1234120421 is 1240214321.

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.

It is a cyclic number.

It is not a de Polignac number, because 1234120421 - 2² = 1234120417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1234120393 and 1234120402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234123421) 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, 1777925 + ... + 1778618.

It is an arithmetic number, because the mean of its divisors is an integer number (309419328).

Almost surely, 2^1234120421 is an apocalyptic number.

It is an amenable number.

1234120421 is a deficient number, since it is larger than the sum of its proper divisors (3556891).

1234120421 is an equidigital number, since it uses as much as digits as its factorization.

1234120421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556890.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1234120421 is about 35130.0501138271. The cubic root of 1234120421 is about 1072.6363560075.

Adding to 1234120421 its reverse (1240214321), we get a palindrome (2474334742).

The spelling of 1234120421 in words is "one billion, two hundred thirty-four million, one hundred twenty thousand, four hundred twenty-one".