221421255544720 has 320 divisors, whose sum is σ = 686075048386560. Its totient is φ = 64403696332800.

The previous prime is 221421255544717. The next prime is 221421255544787. The reversal of 221421255544720 is 27445552124122.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13249980 + ... + 24867739.

It is an arithmetic number, because the mean of its divisors is an integer number (2143984526208).

Almost surely, 2^{221421255544720} is an apocalyptic number.

221421255544720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221421255544720 is an abundant number, since it is smaller than the sum of its proper divisors (464653792841840).

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

221421255544720 is a wasteful number, since it uses less digits than its factorization.

221421255544720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38117814 (or 38117808 counting only the distinct ones).

The product of its (nonzero) digits is 1792000, while the sum is 46.

The spelling of 221421255544720 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-four thousand, seven hundred twenty".