421515252 has 60 divisors (see below), whose sum is σ = 1103861220. Its totient is φ = 140258304.

The previous prime is 421515239. The next prime is 421515253. The reversal of 421515252 is 252515124.

It can be written as a sum of positive squares in 2 ways, for example, as 168896016 + 252619236 = 12996^2 + 15894^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421515253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 345748 + ... + 346964.

It is an arithmetic number, because the mean of its divisors is an integer number (18397687).

Almost surely, 2^421515252 is an apocalyptic number.

It is an amenable number.

421515252 is an abundant number, since it is smaller than the sum of its proper divisors (682345968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421515252 is a wasteful number, since it uses less digits than its factorization.

421515252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2302 (or 2291 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 421515252 is about 20530.8366122767. The cubic root of 421515252 is about 749.7867553747.

The spelling of 421515252 in words is "four hundred twenty-one million, five hundred fifteen thousand, two hundred fifty-two".