21620610431129 has 2 divisors, whose sum is σ = 21620610431130. Its totient is φ = 21620610431128.

The previous prime is 21620610431051. The next prime is 21620610431153. The reversal of 21620610431129 is 92113401602612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18093155496025 + 3527454935104 = 4253605^2 + 1878152^2 .

It is a cyclic number.

It is not a de Polignac number, because 21620610431129 - 2²⁴ = 21620593653913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21620610431092 and 21620610431101.

It is not a weakly prime, because it can be changed into another prime (21620610131129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810305215564 + 10810305215565.

It is an arithmetic number, because the mean of its divisors is an integer number (10810305215565).

Almost surely, 2^{21620610431129} is an apocalyptic number.

It is an amenable number.

21620610431129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21620610431129 is an equidigital number, since it uses as much as digits as its factorization.

21620610431129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 21620610431129 in words is "twenty-one trillion, six hundred twenty billion, six hundred ten million, four hundred thirty-one thousand, one hundred twenty-nine".