21315602635 has 16 divisors (see below), whose sum is σ = 26414576640. Its totient is φ = 16495693920.

The previous prime is 21315602629. The next prime is 21315602639. The reversal of 21315602635 is 53620651312.

It is not a de Polignac number, because 21315602635 - 2⁵ = 21315602603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21315602635.

It is not an unprimeable number, because it can be changed into a prime (21315602639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373084 + ... + 426406.

It is an arithmetic number, because the mean of its divisors is an integer number (1650911040).

Almost surely, 2^21315602635 is an apocalyptic number.

21315602635 is a deficient number, since it is larger than the sum of its proper divisors (5098974005).

21315602635 is a wasteful number, since it uses less digits than its factorization.

21315602635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55938.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 21315602635 in words is "twenty-one billion, three hundred fifteen million, six hundred two thousand, six hundred thirty-five".