212517231 has 8 divisors (see below), whose sum is σ = 286162224. Its totient is φ = 140275200.

The previous prime is 212517199. The next prime is 212517247. The reversal of 212517231 is 132715212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212517231 - 2⁵ = 212517199 is a prime.

It is a super-2 number, since 2×212517231² = 90327146943814722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212517251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350386 + ... + 350991.

It is an arithmetic number, because the mean of its divisors is an integer number (35770278).

Almost surely, 2^212517231 is an apocalyptic number.

212517231 is a deficient number, since it is larger than the sum of its proper divisors (73644993).

212517231 is a wasteful number, since it uses less digits than its factorization.

212517231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701481.

The product of its digits is 840, while the sum is 24.

The square root of 212517231 is about 14577.9707435569. The cubic root of 212517231 is about 596.7577248680.

It can be divided in two parts, 21251 and 7231, that added together give a palindrome (28482).

The spelling of 212517231 in words is "two hundred twelve million, five hundred seventeen thousand, two hundred thirty-one".