221520570172 has 48 divisors (see below), whose sum is σ = 428008613760. Its totient is φ = 99479816000.

The previous prime is 221520570149. The next prime is 221520570287. The reversal of 221520570172 is 271075025122.

221520570172 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221520570172² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 2021979 + ... + 2128717.

It is an arithmetic number, because the mean of its divisors is an integer number (8916846120).

Almost surely, 2^221520570172 is an apocalyptic number.

221520570172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221520570172 is a deficient number, since it is larger than the sum of its proper divisors (206488043588).

221520570172 is a wasteful number, since it uses less digits than its factorization.

221520570172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107322 (or 107320 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 34.

Adding to 221520570172 its reverse (271075025122), we get a palindrome (492595595294).

The spelling of 221520570172 in words is "two hundred twenty-one billion, five hundred twenty million, five hundred seventy thousand, one hundred seventy-two".