101310020021 has 6 divisors (see below), whose sum is σ = 117850431510. Its totient is φ = 86837159976.

The previous prime is 101310019973. The next prime is 101310020041. The reversal of 101310020021 is 120020013101.

It can be written as a sum of positive squares in only one way, i.e., 93690475921 + 7619544100 = 306089^2 + 87290^2 .

It is not a de Polignac number, because 101310020021 - 2²² = 101305825717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101310019984 and 101310020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101310020041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1033775666 + ... + 1033775763.

It is an arithmetic number, because the mean of its divisors is an integer number (19641738585).

Almost surely, 2^101310020021 is an apocalyptic number.

It is an amenable number.

101310020021 is a deficient number, since it is larger than the sum of its proper divisors (16540411489).

101310020021 is an equidigital number, since it uses as much as digits as its factorization.

101310020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067551443 (or 2067551436 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 101310020021 its reverse (120020013101), we get a palindrome (221330033122).

The spelling of 101310020021 in words is "one hundred one billion, three hundred ten million, twenty thousand, twenty-one".