421525420 has 12 divisors (see below), whose sum is σ = 885203424. Its totient is φ = 168610160.

The previous prime is 421525397. The next prime is 421525427. The reversal of 421525420 is 24525124.

It is not an unprimeable number, because it can be changed into a prime (421525427) 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 3 ways as a sum of consecutive naturals, for example, 10538116 + ... + 10538155.

It is an arithmetic number, because the mean of its divisors is an integer number (73766952).

Almost surely, 2^421525420 is an apocalyptic number.

It is an amenable number.

421525420 is an abundant number, since it is smaller than the sum of its proper divisors (463678004).

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

421525420 is a wasteful number, since it uses less digits than its factorization.

421525420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21076280 (or 21076278 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 421525420 is about 20531.0842382958. The cubic root of 421525420 is about 749.7927842356.

The spelling of 421525420 in words is "four hundred twenty-one million, five hundred twenty-five thousand, four hundred twenty".