252006721 has 8 divisors (see below), whose sum is σ = 255213504. Its totient is φ = 248815920.

The previous prime is 252006673. The next prime is 252006739. The reversal of 252006721 is 127600252.

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

It is a cyclic number.

It is not a de Polignac number, because 252006721 - 2¹⁹ = 251482433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252006751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29491 + ... + 37063.

It is an arithmetic number, because the mean of its divisors is an integer number (31901688).

Almost surely, 2^252006721 is an apocalyptic number.

It is an amenable number.

252006721 is a deficient number, since it is larger than the sum of its proper divisors (3206783).

252006721 is a wasteful number, since it uses less digits than its factorization.

252006721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7991.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 252006721 is about 15874.7195565780. The cubic root of 252006721 is about 631.6415750931.

Adding to 252006721 its reverse (127600252), we get a palindrome (379606973).

The spelling of 252006721 in words is "two hundred fifty-two million, six thousand, seven hundred twenty-one".