621121383831 has 64 divisors (see below), whose sum is σ = 946220172800. Its totient is φ = 359259784704.

The previous prime is 621121383809. The next prime is 621121383859. The reversal of 621121383831 is 138383121126.

It is a happy number.

621121383831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621121383831 - 2⁷ = 621121383703 is a prime.

It is a super-2 number, since 2×621121383831² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 621121383831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621121383731) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74035785 + ... + 74044173.

It is an arithmetic number, because the mean of its divisors is an integer number (14784690200).

Almost surely, 2^621121383831 is an apocalyptic number.

621121383831 is a deficient number, since it is larger than the sum of its proper divisors (325098788969).

621121383831 is a wasteful number, since it uses less digits than its factorization.

621121383831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9200.

The product of its digits is 41472, while the sum is 39.

The spelling of 621121383831 in words is "six hundred twenty-one billion, one hundred twenty-one million, three hundred eighty-three thousand, eight hundred thirty-one".