21112641931 has 2 divisors, whose sum is σ = 21112641932. Its totient is φ = 21112641930.

The previous prime is 21112641923. The next prime is 21112641937. The reversal of 21112641931 is 13914621112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112641931 - 2³ = 21112641923 is a prime.

It is a super-2 number, since 2×21112641931² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21112641893 and 21112641902.

It is not a weakly prime, because it can be changed into another prime (21112641937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556320965 + 10556320966.

It is an arithmetic number, because the mean of its divisors is an integer number (10556320966).

Almost surely, 2^21112641931 is an apocalyptic number.

21112641931 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112641931 is an equidigital number, since it uses as much as digits as its factorization.

21112641931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 31.

The spelling of 21112641931 in words is "twenty-one billion, one hundred twelve million, six hundred forty-one thousand, nine hundred thirty-one".