31120022120021 has 32 divisors (see below), whose sum is σ = 32645427210240. Its totient is φ = 29660235730560.

The previous prime is 31120022120017. The next prime is 31120022120027. The reversal of 31120022120021 is 12002122002113.

It is not a de Polignac number, because 31120022120021 - 2² = 31120022120017 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 (31120022120027) 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, 1541882696 + ... + 1541902878.

It is an arithmetic number, because the mean of its divisors is an integer number (1020169600320).

Almost surely, 2^{31120022120021} is an apocalyptic number.

31120022120021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31120022120021 is a deficient number, since it is larger than the sum of its proper divisors (1525405090219).

31120022120021 is an frugal number, since it uses more digits than its factorization.

31120022120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21058 (or 20996 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 31120022120021 its reverse (12002122002113), we get a palindrome (43122144122134).

The spelling of 31120022120021 in words is "thirty-one trillion, one hundred twenty billion, twenty-two million, one hundred twenty thousand, twenty-one".