21024000402 has 64 divisors (see below), whose sum is σ = 46610049024. Its totient is φ = 6288226560.

The previous prime is 21024000367. The next prime is 21024000421. The reversal of 21024000402 is 20400042012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 705627 + ... + 734817.

It is an arithmetic number, because the mean of its divisors is an integer number (728282016).

Almost surely, 2^21024000402 is an apocalyptic number.

21024000402 is an abundant number, since it is smaller than the sum of its proper divisors (25586048622).

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

21024000402 is a wasteful number, since it uses less digits than its factorization.

21024000402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29543.

The product of its (nonzero) digits is 128, while the sum is 15.

Adding to 21024000402 its reverse (20400042012), we get a palindrome (41424042414).

The spelling of 21024000402 in words is "twenty-one billion, twenty-four million, four hundred two", and thus it is an aban number.