21013242402 has 16 divisors (see below), whose sum is σ = 42134526720. Its totient is φ = 6986407152.

The previous prime is 21013242391. The next prime is 21013242421. The reversal of 21013242402 is 20424231012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4499218 + ... + 4503885.

It is an arithmetic number, because the mean of its divisors is an integer number (2633407920).

Almost surely, 2^21013242402 is an apocalyptic number.

21013242402 is an abundant number, since it is smaller than the sum of its proper divisors (21121284318).

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

21013242402 is a wasteful number, since it uses less digits than its factorization.

21013242402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9003497.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21013242402 its reverse (20424231012), we get a palindrome (41437473414).

The spelling of 21013242402 in words is "twenty-one billion, thirteen million, two hundred forty-two thousand, four hundred two".