21331121013731 has 2 divisors, whose sum is σ = 21331121013732. Its totient is φ = 21331121013730.

The previous prime is 21331121013703. The next prime is 21331121013737. The reversal of 21331121013731 is 13731012113312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21331121013731 is a prime.

It is a super-2 number, since 2×21331121013731² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 21331121013694 and 21331121013703.

It is not a weakly prime, because it can be changed into another prime (21331121013737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665560506865 + 10665560506866.

It is an arithmetic number, because the mean of its divisors is an integer number (10665560506866).

Almost surely, 2^{21331121013731} is an apocalyptic number.

21331121013731 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331121013731 is an equidigital number, since it uses as much as digits as its factorization.

21331121013731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The spelling of 21331121013731 in words is "twenty-one trillion, three hundred thirty-one billion, one hundred twenty-one million, thirteen thousand, seven hundred thirty-one".