221231311200020 has 48 divisors (see below), whose sum is σ = 506933878223808. Its totient is φ = 80429804098560.

The previous prime is 221231311200013. The next prime is 221231311200047. The reversal of 221231311200020 is 20002113132122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221231311199965 and 221231311200001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111170429 + ... + 113142948.

It is an arithmetic number, because the mean of its divisors is an integer number (10561122462996).

Almost surely, 2^{221231311200020} is an apocalyptic number.

221231311200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221231311200020 is an abundant number, since it is smaller than the sum of its proper divisors (285702567023788).

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

221231311200020 is a wasteful number, since it uses less digits than its factorization.

221231311200020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224317880 (or 224317878 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221231311200020 its reverse (20002113132122), we get a palindrome (241233424332142).

The spelling of 221231311200020 in words is "two hundred twenty-one trillion, two hundred thirty-one billion, three hundred eleven million, two hundred thousand, twenty".