221989405125 has 32 divisors (see below), whose sum is σ = 371602393344. Its totient is φ = 117685368000.

The previous prime is 221989405111. The next prime is 221989405147. The reversal of 221989405125 is 521504989122.

It is not a de Polignac number, because 221989405125 - 2⁴ = 221989405109 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1709746 + ... + 1834995.

It is an arithmetic number, because the mean of its divisors is an integer number (11612574792).

Almost surely, 2^221989405125 is an apocalyptic number.

221989405125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221989405125 is a deficient number, since it is larger than the sum of its proper divisors (149612988219).

221989405125 is a wasteful number, since it uses less digits than its factorization.

221989405125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544926 (or 3544916 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 48.

The spelling of 221989405125 in words is "two hundred twenty-one billion, nine hundred eighty-nine million, four hundred five thousand, one hundred twenty-five".