21412807 has 6 divisors (see below), whose sum is σ = 23186832. Its totient is φ = 19765512.

The previous prime is 21412801. The next prime is 21412823. The reversal of 21412807 is 70821412.

It is a happy number.

It is not a de Polignac number, because 21412807 - 2³ = 21412799 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 (21412801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63183 + ... + 63520.

It is an arithmetic number, because the mean of its divisors is an integer number (3864472).

Almost surely, 2^21412807 is an apocalyptic number.

21412807 is a deficient number, since it is larger than the sum of its proper divisors (1774025).

21412807 is a wasteful number, since it uses less digits than its factorization.

21412807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126729 (or 126716 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 21412807 is about 4627.3974326829. The cubic root of 21412807 is about 277.6884827233.

The spelling of 21412807 in words is "twenty-one million, four hundred twelve thousand, eight hundred seven".