421505252 has 36 divisors (see below), whose sum is σ = 866436480. Its totient is φ = 178882704.

The previous prime is 421505251. The next prime is 421505257. The reversal of 421505252 is 252505124.

It is not an unprimeable number, because it can be changed into a prime (421505251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9749 + ... + 30627.

It is an arithmetic number, because the mean of its divisors is an integer number (24067680).

Almost surely, 2^421505252 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421505252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (433218240).

421505252 is an abundant number, since it is smaller than the sum of its proper divisors (444931228).

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

421505252 is a wasteful number, since it uses less digits than its factorization.

421505252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21000 (or 20991 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 421505252 is about 20530.5930747263. The cubic root of 421505252 is about 749.7808260307.

The spelling of 421505252 in words is "four hundred twenty-one million, five hundred five thousand, two hundred fifty-two".