31311200221020 has 120 divisors (see below), whose sum is σ = 98227838437344. Its totient is φ = 8349360660864.

The previous prime is 31311200220959. The next prime is 31311200221099. The reversal of 31311200221020 is 2012200211313.

31311200221020 is a `hidden beast` number, since 31 + 311 + 200 + 22 + 102 + 0 = 666.

It is a super-3 number, since 3×31311200221020³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31311200220984 and 31311200221002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 48012049 + ... + 48659831.

Almost surely, 2^{31311200221020} is an apocalyptic number.

31311200221020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31311200221020 is an abundant number, since it is smaller than the sum of its proper divisors (66916638216324).

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

31311200221020 is a wasteful number, since it uses less digits than its factorization.

31311200221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677641 (or 677630 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31311200221020 its reverse (2012200211313), we get a palindrome (33323400432333).

The spelling of 31311200221020 in words is "thirty-one trillion, three hundred eleven billion, two hundred million, two hundred twenty-one thousand, twenty".