21002699634 has 32 divisors (see below), whose sum is σ = 48300702720. Its totient is φ = 5963954832.

The previous prime is 21002699629. The next prime is 21002699651. The reversal of 21002699634 is 43699620012.

21002699634 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21002699634² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1527094 + ... + 1540785.

It is an arithmetic number, because the mean of its divisors is an integer number (1509396960).

Almost surely, 2^21002699634 is an apocalyptic number.

21002699634 is an abundant number, since it is smaller than the sum of its proper divisors (27298003086).

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

21002699634 is a wasteful number, since it uses less digits than its factorization.

21002699634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3068054.

The product of its (nonzero) digits is 139968, while the sum is 42.

The spelling of 21002699634 in words is "twenty-one billion, two million, six hundred ninety-nine thousand, six hundred thirty-four".