31311021023011 has 4 divisors (see below), whose sum is σ = 31311046994800. Its totient is φ = 31310995051224.

The previous prime is 31311021022997. The next prime is 31311021023047. The reversal of 31311021023011 is 11032012011313.

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 31311021023011 - 2⁵ = 31311021022979 is a prime.

It is a super-2 number, since 2×31311021023011² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31311021023011.

It is not an unprimeable number, because it can be changed into a prime (31311021023311) 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, 11084751 + ... + 13619608.

It is an arithmetic number, because the mean of its divisors is an integer number (7827761748700).

Almost surely, 2^{31311021023011} is an apocalyptic number.

31311021023011 is a deficient number, since it is larger than the sum of its proper divisors (25971789).

31311021023011 is a wasteful number, since it uses less digits than its factorization.

31311021023011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25971788.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 31311021023011 its reverse (11032012011313), we get a palindrome (42343033034324).

The spelling of 31311021023011 in words is "thirty-one trillion, three hundred eleven billion, twenty-one million, twenty-three thousand, eleven".