421525999 has 12 divisors (see below), whose sum is σ = 450669744. Its totient is φ = 392902272.

The previous prime is 421525981. The next prime is 421526009. The reversal of 421525999 is 999525124.

It is not a de Polignac number, because 421525999 - 2⁵ = 421525967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421525099) 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, 200934 + ... + 203020.

It is an arithmetic number, because the mean of its divisors is an integer number (37555812).

Almost surely, 2^421525999 is an apocalyptic number.

421525999 is a deficient number, since it is larger than the sum of its proper divisors (29143745).

421525999 is a wasteful number, since it uses less digits than its factorization.

421525999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2322 (or 2213 counting only the distinct ones).

The product of its digits is 291600, while the sum is 46.

The square root of 421525999 is about 20531.0983388615. The cubic root of 421525999 is about 749.7931275362.

The spelling of 421525999 in words is "four hundred twenty-one million, five hundred twenty-five thousand, nine hundred ninety-nine".