252021001 has 2 divisors, whose sum is σ = 252021002. Its totient is φ = 252021000.

The previous prime is 252020999. The next prime is 252021013. The reversal of 252021001 is 100120252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191102976 + 60918025 = 13824^2 + 7805^2 .

It is a cyclic number.

It is not a de Polignac number, because 252021001 - 2¹ = 252020999 is a prime.

Together with 252020999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (252021071) 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 as a sum of consecutive naturals, namely, 126010500 + 126010501.

It is an arithmetic number, because the mean of its divisors is an integer number (126010501).

Almost surely, 2^252021001 is an apocalyptic number.

It is an amenable number.

252021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

252021001 is an equidigital number, since it uses as much as digits as its factorization.

252021001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 252021001 is about 15875.1693219317. The cubic root of 252021001 is about 631.6535055571.

Adding to 252021001 its reverse (100120252), we get a palindrome (352141253).

The spelling of 252021001 in words is "two hundred fifty-two million, twenty-one thousand, one".