252342542521 has 4 divisors (see below), whose sum is σ = 255536752000. Its totient is φ = 249148333044.

The previous prime is 252342542509. The next prime is 252342542561. The reversal of 252342542521 is 125245243252.

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 252342542521 - 2⁵ = 252342542489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252342542561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1597104621 + ... + 1597104778.

It is an arithmetic number, because the mean of its divisors is an integer number (63884188000).

Almost surely, 2^252342542521 is an apocalyptic number.

It is an amenable number.

252342542521 is a deficient number, since it is larger than the sum of its proper divisors (3194209479).

252342542521 is an equidigital number, since it uses as much as digits as its factorization.

252342542521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3194209478.

The product of its digits is 192000, while the sum is 37.

Adding to 252342542521 its reverse (125245243252), we get a palindrome (377587785773).

The spelling of 252342542521 in words is "two hundred fifty-two billion, three hundred forty-two million, five hundred forty-two thousand, five hundred twenty-one".