21034402424 has 16 divisors (see below), whose sum is σ = 45073719600. Its totient is φ = 9014743872.

The previous prime is 21034402399. The next prime is 21034402429. The reversal of 21034402424 is 42420443012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21034402393 and 21034402402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034402429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187807109 + ... + 187807220.

It is an arithmetic number, because the mean of its divisors is an integer number (2817107475).

Almost surely, 2^21034402424 is an apocalyptic number.

It is an amenable number.

21034402424 is an abundant number, since it is smaller than the sum of its proper divisors (24039317176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21034402424 is a wasteful number, since it uses less digits than its factorization.

21034402424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375614342 (or 375614338 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 21034402424 its reverse (42420443012), we get a palindrome (63454845436).

The spelling of 21034402424 in words is "twenty-one billion, thirty-four million, four hundred two thousand, four hundred twenty-four".