31311130133021 has 8 divisors (see below), whose sum is σ = 32041225945344. Its totient is φ = 30581122047840.

The previous prime is 31311130132979. The next prime is 31311130133053. The reversal of 31311130133021 is 12033103111313.

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 31311130133021 - 2¹⁸ = 31311129870877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311130133821) 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 7 ways as a sum of consecutive naturals, for example, 21209360 + ... + 22637561.

It is an arithmetic number, because the mean of its divisors is an integer number (4005153243168).

Almost surely, 2^{31311130133021} is an apocalyptic number.

It is an amenable number.

31311130133021 is a deficient number, since it is larger than the sum of its proper divisors (730095812323).

31311130133021 is a wasteful number, since it uses less digits than its factorization.

31311130133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43863571.

The product of its (nonzero) digits is 486, while the sum is 23.

Adding to 31311130133021 its reverse (12033103111313), we get a palindrome (43344233244334).

The spelling of 31311130133021 in words is "thirty-one trillion, three hundred eleven billion, one hundred thirty million, one hundred thirty-three thousand, twenty-one".