2331311021220 has 72 divisors (see below), whose sum is σ = 6690765840192. Its totient is φ = 606519914240.

The previous prime is 2331311021209. The next prime is 2331311021231. The reversal of 2331311021220 is 221201131332.

It is an interprime number because it is at equal distance from previous prime (2331311021209) and next prime (2331311021231).

It is a super-2 number, since 2×2331311021220² (a number of 26 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11456304 + ... + 11658023.

It is an arithmetic number, because the mean of its divisors is an integer number (92927303336).

Almost surely, 2^{2331311021220} is an apocalyptic number.

2331311021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2331311021220 is an abundant number, since it is smaller than the sum of its proper divisors (4359454818972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2331311021220 is a wasteful number, since it uses less digits than its factorization.

2331311021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23114421 (or 23114378 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 2331311021220 its reverse (221201131332), we get a palindrome (2552512152552).

The spelling of 2331311021220 in words is "two trillion, three hundred thirty-one billion, three hundred eleven million, twenty-one thousand, two hundred twenty".