421522684 has 36 divisors (see below), whose sum is σ = 854872200. Its totient is φ = 180325120.

The previous prime is 421522637. The next prime is 421522687. The reversal of 421522684 is 486225124.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421522687) 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 11 ways as a sum of consecutive naturals, for example, 3859 + ... + 29290.

It is an arithmetic number, because the mean of its divisors is an integer number (23746450).

Almost surely, 2^421522684 is an apocalyptic number.

421522684 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

421522684 is an abundant number, since it is smaller than the sum of its proper divisors (433349516).

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

421522684 is a wasteful number, since it uses less digits than its factorization.

421522684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33198 (or 33179 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 421522684 is about 20531.0176075128. The cubic root of 421522684 is about 749.7911620025.

The spelling of 421522684 in words is "four hundred twenty-one million, five hundred twenty-two thousand, six hundred eighty-four".