221421251703454 has 16 divisors (see below), whose sum is σ = 366691054302720. Its totient is φ = 99433420807960.

The previous prime is 221421251703451. The next prime is 221421251703493. The reversal of 221421251703454 is 454307152124122.

221421251703454 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221421251703454.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221421251703451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60630132814 + ... + 60630136465.

It is an arithmetic number, because the mean of its divisors is an integer number (22918190893920).

Almost surely, 2^{221421251703454} is an apocalyptic number.

221421251703454 is a deficient number, since it is larger than the sum of its proper divisors (145269802599266).

221421251703454 is a wasteful number, since it uses less digits than its factorization.

221421251703454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121260269375.

The product of its (nonzero) digits is 537600, while the sum is 43.

The spelling of 221421251703454 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-one million, seven hundred three thousand, four hundred fifty-four".