252246021 has 4 divisors (see below), whose sum is σ = 336328032. Its totient is φ = 168164012.

The previous prime is 252246013. The next prime is 252246023. The reversal of 252246021 is 120642252.

It is a happy number.

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 cyclic number.

It is not a de Polignac number, because 252246021 - 2³ = 252246013 is a prime.

It is a super-2 number, since 2×252246021² = 127256110220664882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 252245982 and 252246000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252246023) 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, 42041001 + ... + 42041006.

It is an arithmetic number, because the mean of its divisors is an integer number (84082008).

Almost surely, 2^252246021 is an apocalyptic number.

It is an amenable number.

252246021 is a deficient number, since it is larger than the sum of its proper divisors (84082011).

252246021 is an equidigital number, since it uses as much as digits as its factorization.

252246021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84082010.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 252246021 is about 15882.2549091746. The cubic root of 252246021 is about 631.8414427925.

Adding to 252246021 its reverse (120642252), we get a palindrome (372888273).

The spelling of 252246021 in words is "two hundred fifty-two million, two hundred forty-six thousand, twenty-one".