252113621 has 8 divisors (see below), whose sum is σ = 269394840. Its totient is φ = 235104768.

The previous prime is 252113611. The next prime is 252113629. The reversal of 252113621 is 126311252.

It can be written as a sum of positive squares in 4 ways, for example, as 39828721 + 212284900 = 6311^2 + 14570^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-252113621 is a prime.

It is a super-2 number, since 2×252113621² = 127122555787463282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252113629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66176 + ... + 69881.

It is an arithmetic number, because the mean of its divisors is an integer number (33674355).

Almost surely, 2^252113621 is an apocalyptic number.

It is an amenable number.

252113621 is a deficient number, since it is larger than the sum of its proper divisors (17281219).

252113621 is a wasteful number, since it uses less digits than its factorization.

252113621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136183.

The product of its digits is 720, while the sum is 23.

The square root of 252113621 is about 15878.0861882029. The cubic root of 252113621 is about 631.7308755408.

Adding to 252113621 its reverse (126311252), we get a palindrome (378424873).

The spelling of 252113621 in words is "two hundred fifty-two million, one hundred thirteen thousand, six hundred twenty-one".