252413021 has 4 divisors (see below), whose sum is σ = 288472032. Its totient is φ = 216354012.

The previous prime is 252413011. The next prime is 252413069. The reversal of 252413021 is 120314252.

252413021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-252413021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 252412984 and 252413002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252413011) 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, 18029495 + ... + 18029508.

It is an arithmetic number, because the mean of its divisors is an integer number (72118008).

Almost surely, 2^252413021 is an apocalyptic number.

It is an amenable number.

252413021 is a deficient number, since it is larger than the sum of its proper divisors (36059011).

252413021 is an equidigital number, since it uses as much as digits as its factorization.

252413021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36059010.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 252413021 is about 15887.5114791461. The cubic root of 252413021 is about 631.9808493436.

Adding to 252413021 its reverse (120314252), we get a palindrome (372727273).

The spelling of 252413021 in words is "two hundred fifty-two million, four hundred thirteen thousand, twenty-one".