21331013233031 has 32 divisors (see below), whose sum is σ = 22043054154240. Its totient is φ = 20626608144384.

The previous prime is 21331013233027. The next prime is 21331013233039. The reversal of 21331013233031 is 13033231013312.

It is a cyclic number.

It is not a de Polignac number, because 21331013233031 - 2² = 21331013233027 is a prime.

It is a super-2 number, since 2×21331013233031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331013233039) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10309816865 + ... + 10309818933.

It is an arithmetic number, because the mean of its divisors is an integer number (688845442320).

Almost surely, 2^{21331013233031} is an apocalyptic number.

21331013233031 is a deficient number, since it is larger than the sum of its proper divisors (712040921209).

21331013233031 is a wasteful number, since it uses less digits than its factorization.

21331013233031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4715.

The product of its (nonzero) digits is 2916, while the sum is 26.

Adding to 21331013233031 its reverse (13033231013312), we get a palindrome (34364244246343).

The spelling of 21331013233031 in words is "twenty-one trillion, three hundred thirty-one billion, thirteen million, two hundred thirty-three thousand, thirty-one".