252221004 has 72 divisors (see below), whose sum is σ = 753785760. Its totient is φ = 69576192.

The previous prime is 252220999. The next prime is 252221023. The reversal of 252221004 is 400122252.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9949 + ... + 24564.

Almost surely, 2^252221004 is an apocalyptic number.

It is an amenable number.

252221004 is an abundant number, since it is smaller than the sum of its proper divisors (501564756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

252221004 is a wasteful number, since it uses less digits than its factorization.

252221004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34559 (or 34554 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 252221004 is about 15881.4673125628. The cubic root of 252221004 is about 631.8205540587.

Adding to 252221004 its reverse (400122252), we get a palindrome (652343256).

The spelling of 252221004 in words is "two hundred fifty-two million, two hundred twenty-one thousand, four".