21264021216131 has 4 divisors (see below), whose sum is σ = 21310147076064. Its totient is φ = 21217895356200.

The previous prime is 21264021216103. The next prime is 21264021216143. The reversal of 21264021216131 is 13161212046212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21264021216131 - 2²⁶ = 21263954107267 is a prime.

It is a super-2 number, since 2×21264021216131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21264021216331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23062929275 + ... + 23062930196.

It is an arithmetic number, because the mean of its divisors is an integer number (5327536769016).

Almost surely, 2^{21264021216131} is an apocalyptic number.

21264021216131 is a deficient number, since it is larger than the sum of its proper divisors (46125859933).

21264021216131 is an equidigital number, since it uses as much as digits as its factorization.

21264021216131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46125859932.

The product of its (nonzero) digits is 6912, while the sum is 32.

The spelling of 21264021216131 in words is "twenty-one trillion, two hundred sixty-four billion, twenty-one million, two hundred sixteen thousand, one hundred thirty-one".