221421255221456 has 40 divisors (see below), whose sum is σ = 443957983156224. Its totient is φ = 106869444612480.

The previous prime is 221421255221437. The next prime is 221421255221461. The reversal of 221421255221456 is 654122552124122.

It is a congruent number.

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, 562037120 + ... + 562430943.

Almost surely, 2^{221421255221456} is an apocalyptic number.

It is an amenable number.

221421255221456 is an abundant number, since it is smaller than the sum of its proper divisors (222536727934768).

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

221421255221456 is a wasteful number, since it uses less digits than its factorization.

221421255221456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124468499 (or 1124468493 counting only the distinct ones).

The product of its digits is 768000, while the sum is 44.

The spelling of 221421255221456 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, two hundred twenty-one thousand, four hundred fifty-six".