21356630402 has 8 divisors (see below), whose sum is σ = 32131728912. Its totient is φ = 10646054100.

The previous prime is 21356630387. The next prime is 21356630437. The reversal of 21356630402 is 20403665312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21356630402² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16129724 + ... + 16131047.

It is an arithmetic number, because the mean of its divisors is an integer number (4016466114).

Almost surely, 2^21356630402 is an apocalyptic number.

21356630402 is a deficient number, since it is larger than the sum of its proper divisors (10775098510).

21356630402 is a wasteful number, since it uses less digits than its factorization.

21356630402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32261104.

The product of its (nonzero) digits is 25920, while the sum is 32.

The spelling of 21356630402 in words is "twenty-one billion, three hundred fifty-six million, six hundred thirty thousand, four hundred two".