221421207127720 has 32 divisors (see below), whose sum is σ = 502853769468000. Its totient is φ = 87740740019008.

The previous prime is 221421207127651. The next prime is 221421207127759. The reversal of 221421207127720 is 27721702124122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25866959170 + ... + 25866967729.

It is an arithmetic number, because the mean of its divisors is an integer number (15714180295875).

Almost surely, 2^{221421207127720} is an apocalyptic number.

221421207127720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221421207127720 is an abundant number, since it is smaller than the sum of its proper divisors (281432562340280).

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

221421207127720 is a wasteful number, since it uses less digits than its factorization.

221421207127720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51733927017 (or 51733927013 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 40.

The spelling of 221421207127720 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred seven million, one hundred twenty-seven thousand, seven hundred twenty".