221253502472 has 12 divisors (see below), whose sum is σ = 414852811695. Its totient is φ = 110626086024.

The previous prime is 221253502469. The next prime is 221253502507. The reversal of 221253502472 is 274205352122.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 110626751236 + 110626751236 = 332606^2 + 332606^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332606.

It is a super-2 number, since 2×221253502472² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1247273 + ... + 1413575.

Almost surely, 2^221253502472 is an apocalyptic number.

It is an amenable number.

221253502472 is a deficient number, since it is larger than the sum of its proper divisors (193599309223).

221253502472 is an frugal number, since it uses more digits than its factorization.

221253502472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332612 (or 166305 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 35.

Adding to 221253502472 its reverse (274205352122), we get a palindrome (495458854594).

The spelling of 221253502472 in words is "two hundred twenty-one billion, two hundred fifty-three million, five hundred two thousand, four hundred seventy-two".