31021100023 has 4 divisors (see below), whose sum is σ = 31025978560. Its totient is φ = 31016221488.

The previous prime is 31021100021. The next prime is 31021100029. The reversal of 31021100023 is 32000112013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31021100023 - 2¹ = 31021100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31021099976 and 31021100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31021100021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2429718 + ... + 2442451.

It is an arithmetic number, because the mean of its divisors is an integer number (7756494640).

Almost surely, 2^31021100023 is an apocalyptic number.

31021100023 is a deficient number, since it is larger than the sum of its proper divisors (4878537).

31021100023 is an equidigital number, since it uses as much as digits as its factorization.

31021100023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4878536.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31021100023 its reverse (32000112013), we get a palindrome (63021212036).

It can be divided in two parts, 31021 and 100023, that added together give a square (131044 = 362²).

The spelling of 31021100023 in words is "thirty-one billion, twenty-one million, one hundred thousand, twenty-three".