311232020021 has 16 divisors (see below), whose sum is σ = 339107731200. Its totient is φ = 283921638528.

The previous prime is 311232019999. The next prime is 311232020053. The reversal of 311232020021 is 120020232113.

It is a cyclic number.

It is not a de Polignac number, because 311232020021 - 2²² = 311227825717 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 (311232020081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2293160 + ... + 2425086.

It is an arithmetic number, because the mean of its divisors is an integer number (21194233200).

Almost surely, 2^311232020021 is an apocalyptic number.

It is an amenable number.

311232020021 is a deficient number, since it is larger than the sum of its proper divisors (27875711179).

311232020021 is a wasteful number, since it uses less digits than its factorization.

311232020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134068.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 311232020021 its reverse (120020232113), we get a palindrome (431252252134).

The spelling of 311232020021 in words is "three hundred eleven billion, two hundred thirty-two million, twenty thousand, twenty-one".