31001010021 has 12 divisors (see below), whose sum is σ = 44966600640. Its totient is φ = 20580864360.

The previous prime is 31001009987. The next prime is 31001010113. The reversal of 31001010021 is 12001010013.

It is not a de Polignac number, because 31001010021 - 2¹⁵ = 31000977253 is a prime.

It is a super-2 number, since 2×31001010021² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 31001009985 and 31001010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001018021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7204035 + ... + 7208336.

It is an arithmetic number, because the mean of its divisors is an integer number (3747216720).

Almost surely, 2^31001010021 is an apocalyptic number.

It is an amenable number.

31001010021 is a deficient number, since it is larger than the sum of its proper divisors (13965590619).

31001010021 is a wasteful number, since it uses less digits than its factorization.

31001010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14412616 (or 14412613 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 31001010021 its reverse (12001010013), we get a palindrome (43002020034).

The spelling of 31001010021 in words is "thirty-one billion, one million, ten thousand, twenty-one".