21034729204 has 24 divisors (see below), whose sum is σ = 39086574408. Its totient is φ = 9870643200.

The previous prime is 21034729159. The next prime is 21034729211. The reversal of 21034729204 is 40292743012.

It can be written as a sum of positive squares in 4 ways, for example, as 4083210000 + 16951519204 = 63900^2 + 130198^2 .

It is a super-2 number, since 2×21034729204² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 21034729204.

It is a congruent number.

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, 414147 + ... + 462154.

It is an arithmetic number, because the mean of its divisors is an integer number (1628607267).

Almost surely, 2^21034729204 is an apocalyptic number.

It is an amenable number.

21034729204 is a deficient number, since it is larger than the sum of its proper divisors (18051845204).

21034729204 is a wasteful number, since it uses less digits than its factorization.

21034729204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876675 (or 876673 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 21034729204 in words is "twenty-one billion, thirty-four million, seven hundred twenty-nine thousand, two hundred four".