12500163870021 has 40 divisors (see below), whose sum is σ = 19440022444920. Its totient is φ = 7994833322112.

The previous prime is 12500163869989. The next prime is 12500163870031. The reversal of 12500163870021 is 12007836100521.

12500163870021 is a `hidden beast` number, since 1 + 2 + 500 + 1 + 63 + 8 + 70 + 0 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1466399902500 + 11033763967521 = 1210950^2 + 3321711^2 .

It is not a de Polignac number, because 12500163870021 - 2⁵ = 12500163869989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12500163870031) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16578606 + ... + 17316191.

It is an arithmetic number, because the mean of its divisors is an integer number (486000561123).

Almost surely, 2^{12500163870021} is an apocalyptic number.

It is an amenable number.

12500163870021 is a deficient number, since it is larger than the sum of its proper divisors (6939858574899).

12500163870021 is a wasteful number, since it uses less digits than its factorization.

12500163870021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33894995 (or 33894986 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Adding to 12500163870021 its reverse (12007836100521), we get a palindrome (24507999970542).

The spelling of 12500163870021 in words is "twelve trillion, five hundred billion, one hundred sixty-three million, eight hundred seventy thousand, twenty-one".