221525151620172 has 48 divisors (see below), whose sum is σ = 520382223900000. Its totient is φ = 73343156961280.

The previous prime is 221525151620093. The next prime is 221525151620203. The reversal of 221525151620172 is 271026151525122.

It is a super-3 number, since 3×221525151620172³ (a number of 44 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41748172 + ... + 46754252.

It is an arithmetic number, because the mean of its divisors is an integer number (10841296331250).

Almost surely, 2^{221525151620172} is an apocalyptic number.

It is an amenable number.

221525151620172 is an abundant number, since it is smaller than the sum of its proper divisors (298857072279828).

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

221525151620172 is a wasteful number, since it uses less digits than its factorization.

221525151620172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5030986 (or 5030984 counting only the distinct ones).

The product of its (nonzero) digits is 168000, while the sum is 42.

The spelling of 221525151620172 in words is "two hundred twenty-one trillion, five hundred twenty-five billion, one hundred fifty-one million, six hundred twenty thousand, one hundred seventy-two".