21412015 has 4 divisors (see below), whose sum is σ = 25694424. Its totient is φ = 17129608.

The previous prime is 21411983. The next prime is 21412021. The reversal of 21412015 is 51021412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21412015 - 2⁵ = 21411983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21412015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2141197 + ... + 2141206.

It is an arithmetic number, because the mean of its divisors is an integer number (6423606).

Almost surely, 2^21412015 is an apocalyptic number.

21412015 is a deficient number, since it is larger than the sum of its proper divisors (4282409).

21412015 is an equidigital number, since it uses as much as digits as its factorization.

21412015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4282408.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 21412015 is about 4627.3118546301. The cubic root of 21412015 is about 277.6850590403.

Adding to 21412015 its reverse (51021412), we get a palindrome (72433427).

The spelling of 21412015 in words is "twenty-one million, four hundred twelve thousand, fifteen".