31120220311021 has 16 divisors (see below), whose sum is σ = 34359300207360. Its totient is φ = 28075164978240.

The previous prime is 31120220310973. The next prime is 31120220311027. The reversal of 31120220311021 is 12011302202113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31120220311021 is a prime.

It is a super-2 number, since 2×31120220311021² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 31120220311021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120220311027) 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, 470900350 + ... + 470966431.

It is an arithmetic number, because the mean of its divisors is an integer number (2147456262960).

Almost surely, 2^{31120220311021} is an apocalyptic number.

It is an amenable number.

31120220311021 is a deficient number, since it is larger than the sum of its proper divisors (3239079896339).

31120220311021 is a wasteful number, since it uses less digits than its factorization.

31120220311021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941866884.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31120220311021 its reverse (12011302202113), we get a palindrome (43131522513134).

The spelling of 31120220311021 in words is "thirty-one trillion, one hundred twenty billion, two hundred twenty million, three hundred eleven thousand, twenty-one".