252607821 has 8 divisors (see below), whose sum is σ = 337358784. Its totient is φ = 168131040.

The previous prime is 252607801. The next prime is 252607829. The reversal of 252607821 is 128706252.

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

It is a de Polignac number, because none of the positive numbers 2^k-252607821 is a prime.

It is a super-2 number, since 2×252607821² = 127621422460736082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252607829) 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 7 ways as a sum of consecutive naturals, for example, 66385 + ... + 70086.

It is an arithmetic number, because the mean of its divisors is an integer number (42169848).

Almost surely, 2^252607821 is an apocalyptic number.

It is an amenable number.

252607821 is a deficient number, since it is larger than the sum of its proper divisors (84750963).

252607821 is a wasteful number, since it uses less digits than its factorization.

252607821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137091.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 252607821 is about 15893.6408981706. The cubic root of 252607821 is about 632.1433848215.

The spelling of 252607821 in words is "two hundred fifty-two million, six hundred seven thousand, eight hundred twenty-one".