252405021 has 8 divisors (see below), whose sum is σ = 367134624. Its totient is φ = 152972720.

The previous prime is 252404983. The next prime is 252405031. The reversal of 252405021 is 120504252.

It is a happy number.

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 252405021 - 2¹³ = 252396829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252405031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3824286 + ... + 3824351.

It is an arithmetic number, because the mean of its divisors is an integer number (45891828).

Almost surely, 2^252405021 is an apocalyptic number.

It is an amenable number.

252405021 is a deficient number, since it is larger than the sum of its proper divisors (114729603).

252405021 is a wasteful number, since it uses less digits than its factorization.

252405021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7648651.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 252405021 is about 15887.2597070735. The cubic root of 252405021 is about 631.9741725879.

Adding to 252405021 its reverse (120504252), we get a palindrome (372909273).

The spelling of 252405021 in words is "two hundred fifty-two million, four hundred five thousand, twenty-one".