21412089 has 12 divisors (see below), whose sum is σ = 30969172. Its totient is φ = 14256000.

The previous prime is 21412049. The next prime is 21412093. The reversal of 21412089 is 98021412.

It can be written as a sum of positive squares in 2 ways, for example, as 11696400 + 9715689 = 3420^2 + 3117^2 .

It is not a de Polignac number, because 21412089 - 2⁸ = 21411833 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21412049) 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, 10989 + ... + 12789.

Almost surely, 2^21412089 is an apocalyptic number.

It is an amenable number.

21412089 is a deficient number, since it is larger than the sum of its proper divisors (9557083).

21412089 is a wasteful number, since it uses less digits than its factorization.

21412089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128 (or 3125 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21412089 is about 4627.3198506263. The cubic root of 21412089 is about 277.6853789334.

The spelling of 21412089 in words is "twenty-one million, four hundred twelve thousand, eighty-nine".