252821004 has 12 divisors (see below), whose sum is σ = 589915704. Its totient is φ = 84273664.

The previous prime is 252821003. The next prime is 252821017. The reversal of 252821004 is 400128252.

252821004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (252821003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10534197 + ... + 10534220.

It is an arithmetic number, because the mean of its divisors is an integer number (49159642).

Almost surely, 2^252821004 is an apocalyptic number.

It is an amenable number.

252821004 is an abundant number, since it is smaller than the sum of its proper divisors (337094700).

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

252821004 is a wasteful number, since it uses less digits than its factorization.

252821004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21068424 (or 21068422 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 252821004 is about 15900.3460339705. The cubic root of 252821004 is about 632.3211628102.

Adding to 252821004 its reverse (400128252), we get a palindrome (652949256).

It can be divided in two parts, 2528 and 21004, that added together give a palindrome (23532).

The spelling of 252821004 in words is "two hundred fifty-two million, eight hundred twenty-one thousand, four".