252420921 has 8 divisors (see below), whose sum is σ = 373956960. Its totient is φ = 168280596.

The previous prime is 252420907. The next prime is 252420923. The reversal of 252420921 is 129024252.

It is a happy number.

It is not a de Polignac number, because 252420921 - 2¹³ = 252412729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 9348923 = 252420921 / (2 + 5 + 2 + 4 + 2 + 0 + 9 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (252420923) 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, 4674435 + ... + 4674488.

It is an arithmetic number, because the mean of its divisors is an integer number (46744620).

Almost surely, 2^252420921 is an apocalyptic number.

It is an amenable number.

252420921 is a deficient number, since it is larger than the sum of its proper divisors (121536039).

252420921 is an equidigital number, since it uses as much as digits as its factorization.

252420921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9348932 (or 9348926 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 252420921 is about 15887.7601001526. The cubic root of 252420921 is about 631.9874425014.

The spelling of 252420921 in words is "two hundred fifty-two million, four hundred twenty thousand, nine hundred twenty-one".