21364757072121 has 16 divisors (see below), whose sum is σ = 28529599146048. Its totient is φ = 14221559404800.

The previous prime is 21364757072111. The next prime is 21364757072143. The reversal of 21364757072121 is 12127075746312.

It is not a de Polignac number, because 21364757072121 - 2¹³ = 21364757063929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21364757072111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3248301 + ... + 7299381.

It is an arithmetic number, because the mean of its divisors is an integer number (1783099946628).

Almost surely, 2^{21364757072121} is an apocalyptic number.

It is an amenable number.

21364757072121 is a deficient number, since it is larger than the sum of its proper divisors (7164842073927).

21364757072121 is a wasteful number, since it uses less digits than its factorization.

21364757072121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053752.

The product of its (nonzero) digits is 987840, while the sum is 48.

The spelling of 21364757072121 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred fifty-seven million, seventy-two thousand, one hundred twenty-one".