21331020031 has 8 divisors (see below), whose sum is σ = 21567902720. Its totient is φ = 21094483968.

The previous prime is 21331020001. The next prime is 21331020037. The reversal of 21331020031 is 13002013312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21331020031 - 2¹³ = 21331011839 is a prime.

It is a super-2 number, since 2×21331020031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21331019987 and 21331020014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331020037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38095 + ... + 210031.

It is an arithmetic number, because the mean of its divisors is an integer number (2695987840).

Almost surely, 2^21331020031 is an apocalyptic number.

21331020031 is a deficient number, since it is larger than the sum of its proper divisors (236882689).

21331020031 is a wasteful number, since it uses less digits than its factorization.

21331020031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173313.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21331020031 its reverse (13002013312), we get a palindrome (34333033343).

The spelling of 21331020031 in words is "twenty-one billion, three hundred thirty-one million, twenty thousand, thirty-one".