252122521 has 4 divisors (see below), whose sum is σ = 288140032. Its totient is φ = 216105012.

The previous prime is 252122503. The next prime is 252122539. The reversal of 252122521 is 125221252.

252122521 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 an interprime number because it is at equal distance from previous prime (252122503) and next prime (252122539).

It is a cyclic number.

It is not a de Polignac number, because 252122521 - 2¹³ = 252114329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 252122492 and 252122501.

It is not an unprimeable number, because it can be changed into a prime (252122561) 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, 18008745 + ... + 18008758.

It is an arithmetic number, because the mean of its divisors is an integer number (72035008).

Almost surely, 2^252122521 is an apocalyptic number.

It is an amenable number.

252122521 is a deficient number, since it is larger than the sum of its proper divisors (36017511).

252122521 is an equidigital number, since it uses as much as digits as its factorization.

252122521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36017510.

The product of its digits is 800, while the sum is 22.

The square root of 252122521 is about 15878.3664462060. The cubic root of 252122521 is about 631.7383091450.

Adding to 252122521 its reverse (125221252), we get a palindrome (377343773).

The spelling of 252122521 in words is "two hundred fifty-two million, one hundred twenty-two thousand, five hundred twenty-one".