100031223031021 has 4 divisors (see below), whose sum is σ = 105296024243200. Its totient is φ = 94766421818844.

The previous prime is 100031223030887. The next prime is 100031223031031. The reversal of 100031223031021 is 120130322130001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100031223031021 is a prime.

It is a super-2 number, since 2×100031223031021² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 5264801212159 = 100031223031021 / (1 + 0 + 0 + 0 + 3 + 1 + 2 + 2 + 3 + 0 + 3 + 1 + 0 + 2 + 1).

It is a self number, because there is not a number n which added to its sum of digits gives 100031223031021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100031223031031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2632400606061 + ... + 2632400606098.

It is an arithmetic number, because the mean of its divisors is an integer number (26324006060800).

Almost surely, 2^{100031223031021} is an apocalyptic number.

It is an amenable number.

100031223031021 is a deficient number, since it is larger than the sum of its proper divisors (5264801212179).

100031223031021 is an equidigital number, since it uses as much as digits as its factorization.

100031223031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5264801212178.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 100031223031021 its reverse (120130322130001), we get a palindrome (220161545161022).

The spelling of 100031223031021 in words is "one hundred trillion, thirty-one billion, two hundred twenty-three million, thirty-one thousand, twenty-one".