90630431021 has 24 divisors (see below), whose sum is σ = 102998472192. Its totient is φ = 79237116000.

The previous prime is 90630431009. The next prime is 90630431051. The reversal of 90630431021 is 12013403609.

It is not a de Polignac number, because 90630431021 - 2¹⁸ = 90630168877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90630431051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 509996 + ... + 664346.

It is an arithmetic number, because the mean of its divisors is an integer number (4291603008).

Almost surely, 2^90630431021 is an apocalyptic number.

It is an amenable number.

90630431021 is a deficient number, since it is larger than the sum of its proper divisors (12368041171).

90630431021 is a wasteful number, since it uses less digits than its factorization.

90630431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154473 (or 154442 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 90630431021 in words is "ninety billion, six hundred thirty million, four hundred thirty-one thousand, twenty-one".