21412927 has 4 divisors (see below), whose sum is σ = 21423640. Its totient is φ = 21402216.

The previous prime is 21412889. The next prime is 21412949. The reversal of 21412927 is 72921412.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21412927 - 2⁷ = 21412799 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21412895 and 21412904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1368 + ... + 6685.

It is an arithmetic number, because the mean of its divisors is an integer number (5355910).

Almost surely, 2^21412927 is an apocalyptic number.

21412927 is a deficient number, since it is larger than the sum of its proper divisors (10713).

21412927 is an equidigital number, since it uses as much as digits as its factorization.

21412927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10712.

The product of its digits is 2016, while the sum is 28.

The square root of 21412927 is about 4627.4103989164. The cubic root of 21412927 is about 277.6890014558.

The spelling of 21412927 in words is "twenty-one million, four hundred twelve thousand, nine hundred twenty-seven".