252121001 has 4 divisors (see below), whose sum is σ = 275041104. Its totient is φ = 229200900.

The previous prime is 252120989. The next prime is 252121003. The reversal of 252121001 is 100121252.

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 252121001 - 2¹⁰ = 252119977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (252121003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11460035 + ... + 11460056.

It is an arithmetic number, because the mean of its divisors is an integer number (68760276).

Almost surely, 2^252121001 is an apocalyptic number.

It is an amenable number.

252121001 is a deficient number, since it is larger than the sum of its proper divisors (22920103).

252121001 is a wasteful number, since it uses less digits than its factorization.

252121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22920102.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 252121001 is about 15878.3185822681. The cubic root of 252121001 is about 631.7370395981.

Adding to 252121001 its reverse (100121252), we get a palindrome (352242253).

The spelling of 252121001 in words is "two hundred fifty-two million, one hundred twenty-one thousand, one".