20101210209931 has 2 divisors, whose sum is σ = 20101210209932. Its totient is φ = 20101210209930.

The previous prime is 20101210209911. The next prime is 20101210209961. The reversal of 20101210209931 is 13990201210102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20101210209931 is a prime.

It is a super-2 number, since 2×20101210209931² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20101210209893 and 20101210209902.

It is not a weakly prime, because it can be changed into another prime (20101210209911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050605104965 + 10050605104966.

It is an arithmetic number, because the mean of its divisors is an integer number (10050605104966).

Almost surely, 2^{20101210209931} is an apocalyptic number.

20101210209931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101210209931 is an equidigital number, since it uses as much as digits as its factorization.

20101210209931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 20101210209931 in words is "twenty trillion, one hundred one billion, two hundred ten million, two hundred nine thousand, nine hundred thirty-one".