17621214057 has 12 divisors (see below), whose sum is σ = 25564015620. Its totient is φ = 11696175648.

The previous prime is 17621214049. The next prime is 17621214067. The reversal of 17621214057 is 75041212671.

17621214057 is a `hidden beast` number, since 1 + 7 + 621 + 21 + 4 + 0 + 5 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11083036176 + 6538177881 = 105276^2 + 80859^2 .

It is not a de Polignac number, because 17621214057 - 2³ = 17621214049 is a prime.

It is a super-2 number, since 2×17621214057² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (17621214047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4272858 + ... + 4276979.

It is an arithmetic number, because the mean of its divisors is an integer number (2130334635).

Almost surely, 2^17621214057 is an apocalyptic number.

It is an amenable number.

17621214057 is a deficient number, since it is larger than the sum of its proper divisors (7942801563).

17621214057 is a wasteful number, since it uses less digits than its factorization.

17621214057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8550072 (or 8550069 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 17621214057 in words is "seventeen billion, six hundred twenty-one million, two hundred fourteen thousand, fifty-seven".