221331021013020 has 96 divisors (see below), whose sum is σ = 622472837995008. Its totient is φ = 58760364886272.

The previous prime is 221331021013009. The next prime is 221331021013061. The reversal of 221331021013020 is 20310120133122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20809287 + ... + 29592033.

It is an arithmetic number, because the mean of its divisors is an integer number (6484092062448).

Almost surely, 2^{221331021013020} is an apocalyptic number.

221331021013020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221331021013020 is an abundant number, since it is smaller than the sum of its proper divisors (401141816981988).

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

221331021013020 is a wasteful number, since it uses less digits than its factorization.

221331021013020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8784619 (or 8784617 counting only the distinct ones).

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

Adding to 221331021013020 its reverse (20310120133122), we get a palindrome (241641141146142).

The spelling of 221331021013020 in words is "two hundred twenty-one trillion, three hundred thirty-one billion, twenty-one million, thirteen thousand, twenty".