21154632704 has 22 divisors (see below), whose sum is σ = 42288608634. Its totient is φ = 10577315840.

The previous prime is 21154632701. The next prime is 21154632727. The reversal of 21154632704 is 40723645112.

It can be written as a sum of positive squares in only one way, i.e., 16261350400 + 4893282304 = 127520^2 + 69952^2 .

It is a super-2 number, since 2×21154632704² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154632701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10328387 + ... + 10330434.

Almost surely, 2^21154632704 is an apocalyptic number.

It is an amenable number.

21154632704 is a deficient number, since it is larger than the sum of its proper divisors (21133975930).

21154632704 is an equidigital number, since it uses as much as digits as its factorization.

21154632704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20658841 (or 20658823 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 21154632704 in words is "twenty-one billion, one hundred fifty-four million, six hundred thirty-two thousand, seven hundred four".