252321021 has 16 divisors (see below), whose sum is σ = 395798400. Its totient is φ = 158318784.

The previous prime is 252320951. The next prime is 252321061. The reversal of 252321021 is 120123252.

It is not a de Polignac number, because 252321021 - 2²² = 248126717 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 252320985 and 252321003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252321061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274401 + ... + 275318.

It is an arithmetic number, because the mean of its divisors is an integer number (24737400).

Almost surely, 2^252321021 is an apocalyptic number.

It is an amenable number.

252321021 is a deficient number, since it is larger than the sum of its proper divisors (143477379).

252321021 is a wasteful number, since it uses less digits than its factorization.

252321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549745 (or 549739 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 252321021 is about 15884.6158593779. The cubic root of 252321021 is about 631.9040581341.

Adding to 252321021 its reverse (120123252), we get a palindrome (372444273).

The spelling of 252321021 in words is "two hundred fifty-two million, three hundred twenty-one thousand, twenty-one".