21726170157672 has 96 divisors (see below), whose sum is σ = 60081984242280. Its totient is φ = 7090000519680.

The previous prime is 21726170157647. The next prime is 21726170157691. The reversal of 21726170157672 is 27675107162712.

21726170157672 is a `hidden beast` number, since 2 + 1 + 7 + 2 + 61 + 7 + 0 + 1 + 576 + 7 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14515688522916 + 7210481634756 = 3809946^2 + 2685234^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4415923 + ... + 7934274.

Almost surely, 2^{21726170157672} is an apocalyptic number.

It is an amenable number.

21726170157672 is an abundant number, since it is smaller than the sum of its proper divisors (38355814084608).

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

21726170157672 is a wasteful number, since it uses less digits than its factorization.

21726170157672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12350723 (or 12350716 counting only the distinct ones).

The product of its (nonzero) digits is 3457440, while the sum is 54.

The spelling of 21726170157672 in words is "twenty-one trillion, seven hundred twenty-six billion, one hundred seventy million, one hundred fifty-seven thousand, six hundred seventy-two".