21360989 has 8 divisors (see below), whose sum is σ = 23329152. Its totient is φ = 19439280.

The previous prime is 21360971. The next prime is 21361001. The reversal of 21360989 is 98906312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21360989 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 (21360289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10649 + ... + 12494.

It is an arithmetic number, because the mean of its divisors is an integer number (2916144).

Almost surely, 2^21360989 is an apocalyptic number.

It is an amenable number.

21360989 is a deficient number, since it is larger than the sum of its proper divisors (1968163).

21360989 is a wasteful number, since it uses less digits than its factorization.

21360989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23227.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 21360989 is about 4621.7949976173. The cubic root of 21360989 is about 277.4643040414.

The spelling of 21360989 in words is "twenty-one million, three hundred sixty thousand, nine hundred eighty-nine".