21704033156 has 12 divisors (see below), whose sum is σ = 40903754892. Its totient is φ = 10017246048.

The previous prime is 21704033137. The next prime is 21704033177. The reversal of 21704033156 is 65133040712.

It can be written as a sum of positive squares in 2 ways, for example, as 2207496256 + 19496536900 = 46984^2 + 139630^2 .

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, 208692575 + ... + 208692678.

It is an arithmetic number, because the mean of its divisors is an integer number (3408646241).

Almost surely, 2^21704033156 is an apocalyptic number.

21704033156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21704033156 is a deficient number, since it is larger than the sum of its proper divisors (19199721736).

21704033156 is a wasteful number, since it uses less digits than its factorization.

21704033156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417385270 (or 417385268 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

Adding to 21704033156 its reverse (65133040712), we get a palindrome (86837073868).

The spelling of 21704033156 in words is "twenty-one billion, seven hundred four million, thirty-three thousand, one hundred fifty-six".