201021208931 has 2 divisors, whose sum is σ = 201021208932. Its totient is φ = 201021208930.

The previous prime is 201021208897. The next prime is 201021208957. The reversal of 201021208931 is 139802120102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201021208931 is a prime.

It is a super-2 number, since 2×201021208931² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201021208894 and 201021208903.

It is not a weakly prime, because it can be changed into another prime (201021208231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510604465 + 100510604466.

It is an arithmetic number, because the mean of its divisors is an integer number (100510604466).

Almost surely, 2^201021208931 is an apocalyptic number.

201021208931 is a deficient number, since it is larger than the sum of its proper divisors (1).

201021208931 is an equidigital number, since it uses as much as digits as its factorization.

201021208931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 201021208931 in words is "two hundred one billion, twenty-one million, two hundred eight thousand, nine hundred thirty-one".