100100021031 has 6 divisors (see below), whose sum is σ = 144588919280. Its totient is φ = 66733347348.

The previous prime is 100100021023. The next prime is 100100021057. The reversal of 100100021031 is 130120001001.

It is not a de Polignac number, because 100100021031 - 2³ = 100100021023 is a prime.

It is a super-2 number, since 2×100100021031² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 11122224559 = 100100021031 / (1 + 0 + 0 + 1 + 0 + 0 + 0 + 2 + 1 + 0 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100100021831) 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, 5561112271 + ... + 5561112288.

Almost surely, 2^100100021031 is an apocalyptic number.

100100021031 is a deficient number, since it is larger than the sum of its proper divisors (44488898249).

100100021031 is a wasteful number, since it uses less digits than its factorization.

100100021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11122224565 (or 11122224562 counting only the distinct ones).

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

Adding to 100100021031 its reverse (130120001001), we get a palindrome (230220022032).

The spelling of 100100021031 in words is "one hundred billion, one hundred million, twenty-one thousand, thirty-one".