221421255544680 has 64 divisors (see below), whose sum is σ = 664307015688000. Its totient is φ = 59041823784960.

The previous prime is 221421255544669. The next prime is 221421255544681. The reversal of 221421255544680 is 86445552124122.

It is not an unprimeable number, because it can be changed into a prime (221421255544681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58217130 + ... + 61903769.

It is an arithmetic number, because the mean of its divisors is an integer number (10379797120125).

Almost surely, 2^{221421255544680} is an apocalyptic number.

221421255544680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221421255544680 is an abundant number, since it is smaller than the sum of its proper divisors (442885760143320).

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

221421255544680 is a wasteful number, since it uses less digits than its factorization.

221421255544680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120136274 (or 120136270 counting only the distinct ones).

The product of its (nonzero) digits is 6144000, while the sum is 51.

The spelling of 221421255544680 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-four thousand, six hundred eighty".