21800164588712 has 96 divisors (see below), whose sum is σ = 42528869064360. Its totient is φ = 10469997619200.

The previous prime is 21800164588711. The next prime is 21800164588751. The reversal of 21800164588712 is 21788546100812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19318890646276 + 2481273942436 = 4395326^2 + 1575206^2 .

It is not an unprimeable number, because it can be changed into a prime (21800164588711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1251651428 + ... + 1251668844.

Almost surely, 2^{21800164588712} is an apocalyptic number.

It is an amenable number.

21800164588712 is a deficient number, since it is larger than the sum of its proper divisors (20728704475648).

21800164588712 is a wasteful number, since it uses less digits than its factorization.

21800164588712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18363 (or 18288 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 53.

The spelling of 21800164588712 in words is "twenty-one trillion, eight hundred billion, one hundred sixty-four million, five hundred eighty-eight thousand, seven hundred twelve".