20021293931 has 2 divisors, whose sum is σ = 20021293932. Its totient is φ = 20021293930.

The previous prime is 20021293879. The next prime is 20021293937. The reversal of 20021293931 is 13939212002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20021293931 - 2⁶ = 20021293867 is a prime.

It is a super-2 number, since 2×20021293931² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20021293937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010646965 + 10010646966.

It is an arithmetic number, because the mean of its divisors is an integer number (10010646966).

Almost surely, 2^20021293931 is an apocalyptic number.

20021293931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021293931 is an equidigital number, since it uses as much as digits as its factorization.

20021293931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 32.

The spelling of 20021293931 in words is "twenty billion, twenty-one million, two hundred ninety-three thousand, nine hundred thirty-one".