21172727162 has 16 divisors (see below), whose sum is σ = 32093819784. Its totient is φ = 10474920000.

The previous prime is 21172727143. The next prime is 21172727201. The reversal of 21172727162 is 26172727112.

It can be written as a sum of positive squares in 4 ways, for example, as 19415356921 + 1757370241 = 139339^2 + 41921^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295112 + ... + 359772.

Almost surely, 2^21172727162 is an apocalyptic number.

21172727162 is a deficient number, since it is larger than the sum of its proper divisors (10921092622).

21172727162 is a wasteful number, since it uses less digits than its factorization.

21172727162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66385.

The product of its digits is 32928, while the sum is 38.

The spelling of 21172727162 in words is "twenty-one billion, one hundred seventy-two million, seven hundred twenty-seven thousand, one hundred sixty-two".