252221607 has 56 divisors (see below), whose sum is σ = 419292288. Its totient is φ = 150368400.

The previous prime is 252221581. The next prime is 252221609. The reversal of 252221607 is 706122252.

252221607 is a `hidden beast` number, since 2 + 52 + 2 + 2 + 1 + 607 = 666.

It is not a de Polignac number, because 252221607 - 2²² = 248027303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252221609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 569128 + ... + 569570.

Almost surely, 2^252221607 is an apocalyptic number.

252221607 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

252221607 is a deficient number, since it is larger than the sum of its proper divisors (167070681).

252221607 is an equidigital number, since it uses as much as digits as its factorization.

252221607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 252221607 is about 15881.4862969434. The cubic root of 252221607 is about 631.8210575688.

Adding to 252221607 its reverse (706122252), we get a palindrome (958343859).

The spelling of 252221607 in words is "two hundred fifty-two million, two hundred twenty-one thousand, six hundred seven".