221421255546654 has 24 divisors (see below), whose sum is σ = 482019731672232. Its totient is φ = 73457288568720.

The previous prime is 221421255546649. The next prime is 221421255546679. The reversal of 221421255546654 is 456645552124122.

221421255546654 is a `hidden beast` number, since 2 + 2 + 1 + 4 + 2 + 1 + 25 + 554 + 6 + 65 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 221421255546654.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29149713889 + ... + 29149721484.

It is an arithmetic number, because the mean of its divisors is an integer number (20084155486343).

Almost surely, 2^{221421255546654} is an apocalyptic number.

221421255546654 is an abundant number, since it is smaller than the sum of its proper divisors (260598476125578).

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

221421255546654 is a wasteful number, since it uses less digits than its factorization.

221421255546654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58299435592 (or 58299435589 counting only the distinct ones).

The product of its digits is 23040000, while the sum is 54.

The spelling of 221421255546654 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, five hundred forty-six thousand, six hundred fifty-four".