2101020631 has 2 divisors, whose sum is σ = 2101020632. Its totient is φ = 2101020630.

The previous prime is 2101020587. The next prime is 2101020637. The reversal of 2101020631 is 1360201012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101020631 is a prime.

It is a super-2 number, since 2×2101020631² = 8828575383775276322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101020637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050510315 + 1050510316.

It is an arithmetic number, because the mean of its divisors is an integer number (1050510316).

Almost surely, 2^2101020631 is an apocalyptic number.

2101020631 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101020631 is an equidigital number, since it uses as much as digits as its factorization.

2101020631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2101020631 is about 45836.8915939988. The cubic root of 2101020631 is about 1280.7865915130.

Adding to 2101020631 its reverse (1360201012), we get a palindrome (3461221643).

The spelling of 2101020631 in words is "two billion, one hundred one million, twenty thousand, six hundred thirty-one".