217391252 has 24 divisors (see below), whose sum is σ = 414892800. Its totient is φ = 99062496.

The previous prime is 217391249. The next prime is 217391263. The reversal of 217391252 is 252193712.

It is a super-2 number, since 2×217391252² = 94517912892255008, which 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 7 ways as a sum of consecutive naturals, for example, 22352 + ... + 30567.

It is an arithmetic number, because the mean of its divisors is an integer number (17287200).

Almost surely, 2^217391252 is an apocalyptic number.

It is an amenable number.

217391252 is a deficient number, since it is larger than the sum of its proper divisors (197501548).

217391252 is a wasteful number, since it uses less digits than its factorization.

217391252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53015 (or 53013 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 217391252 is about 14744.1938402885. The cubic root of 217391252 is about 601.2854404012.

The spelling of 217391252 in words is "two hundred seventeen million, three hundred ninety-one thousand, two hundred fifty-two".