252421207 has 4 divisors (see below), whose sum is σ = 253742976. Its totient is φ = 251099440.

The previous prime is 252421193. The next prime is 252421217. The reversal of 252421207 is 702124252.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 252421207 - 2¹⁹ = 251896919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252421217) 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, 660598 + ... + 660979.

It is an arithmetic number, because the mean of its divisors is an integer number (63435744).

Almost surely, 2^252421207 is an apocalyptic number.

252421207 is a deficient number, since it is larger than the sum of its proper divisors (1321769).

252421207 is a wasteful number, since it uses less digits than its factorization.

252421207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321768.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 252421207 is about 15887.7691007894. The cubic root of 252421207 is about 631.9876811878.

Adding to 252421207 its reverse (702124252), we get a palindrome (954545459).

The spelling of 252421207 in words is "two hundred fifty-two million, four hundred twenty-one thousand, two hundred seven".