221502057172 has 48 divisors (see below), whose sum is σ = 428632468992. Its totient is φ = 99313958880.

The previous prime is 221502057167. The next prime is 221502057223. The reversal of 221502057172 is 271750205122.

It is a super-2 number, since 2×221502057172² (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, 2301073 + ... + 2395399.

It is an arithmetic number, because the mean of its divisors is an integer number (8929843104).

Almost surely, 2^221502057172 is an apocalyptic number.

221502057172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221502057172 is a deficient number, since it is larger than the sum of its proper divisors (207130411820).

221502057172 is a wasteful number, since it uses less digits than its factorization.

221502057172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95068 (or 95066 counting only the distinct ones).

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

The spelling of 221502057172 in words is "two hundred twenty-one billion, five hundred two million, fifty-seven thousand, one hundred seventy-two".