221555040370125 has 96 divisors (see below), whose sum is σ = 467845324412544. Its totient is φ = 92074821888000.

The previous prime is 221555040370093. The next prime is 221555040370133. The reversal of 221555040370125 is 521073040555122.

It is a happy number.

It is not a de Polignac number, because 221555040370125 - 2⁵ = 221555040370093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 547862292 + ... + 548266541.

It is an arithmetic number, because the mean of its divisors is an integer number (4873388795964).

Almost surely, 2^{221555040370125} is an apocalyptic number.

221555040370125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221555040370125 is an abundant number, since it is smaller than the sum of its proper divisors (246290284042419).

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

221555040370125 is a wasteful number, since it uses less digits than its factorization.

221555040370125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096128876 (or 1096128859 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 42.

The spelling of 221555040370125 in words is "two hundred twenty-one trillion, five hundred fifty-five billion, forty million, three hundred seventy thousand, one hundred twenty-five".