21621337377131 has 2 divisors, whose sum is σ = 21621337377132. Its totient is φ = 21621337377130.

The previous prime is 21621337377089. The next prime is 21621337377173. The reversal of 21621337377131 is 13177373312612.

It is a balanced prime because it is at equal distance from previous prime (21621337377089) and next prime (21621337377173).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21621337377131 is a prime.

It is a super-2 number, since 2×21621337377131² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21621337377631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810668688565 + 10810668688566.

It is an arithmetic number, because the mean of its divisors is an integer number (10810668688566).

Almost surely, 2^{21621337377131} is an apocalyptic number.

21621337377131 is a deficient number, since it is larger than the sum of its proper divisors (1).

21621337377131 is an equidigital number, since it uses as much as digits as its factorization.

21621337377131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 666792, while the sum is 47.

The spelling of 21621337377131 in words is "twenty-one trillion, six hundred twenty-one billion, three hundred thirty-seven million, three hundred seventy-seven thousand, one hundred thirty-one".