1423123421 has 4 divisors (see below), whose sum is σ = 1426365600. Its totient is φ = 1419881244.

The previous prime is 1423123411. The next prime is 1423123423. The reversal of 1423123421 is 1243213241.

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 1423123421 - 2⁶ = 1423123357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1423123423) 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, 1620431 + ... + 1621308.

It is an arithmetic number, because the mean of its divisors is an integer number (356591400).

Almost surely, 2^1423123421 is an apocalyptic number.

It is an amenable number.

1423123421 is a deficient number, since it is larger than the sum of its proper divisors (3242179).

1423123421 is an equidigital number, since it uses as much as digits as its factorization.

1423123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3242178.

The product of its digits is 1152, while the sum is 23.

The square root of 1423123421 is about 37724.3080917331. The cubic root of 1423123421 is about 1124.8143683179.

Adding to 1423123421 its reverse (1243213241), we get a palindrome (2666336662).

The spelling of 1423123421 in words is "one billion, four hundred twenty-three million, one hundred twenty-three thousand, four hundred twenty-one".