221421255444744 has 128 divisors (see below), whose sum is σ = 561924519886080. Its totient is φ = 72699521126400.

The previous prime is 221421255444643. The next prime is 221421255444761. The reversal of 221421255444744 is 447444552124122.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 386623884 + ... + 387196164.

It is an arithmetic number, because the mean of its divisors is an integer number (4390035311610).

Almost surely, 2^{221421255444744} is an apocalyptic number.

221421255444744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221421255444744 is an abundant number, since it is smaller than the sum of its proper divisors (340503264441336).

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

221421255444744 is a wasteful number, since it uses less digits than its factorization.

221421255444744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573231 (or 573227 counting only the distinct ones).

The product of its digits is 11468800, while the sum is 51.

The spelling of 221421255444744 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, four hundred forty-four thousand, seven hundred forty-four".