21368089 has 8 divisors (see below), whose sum is σ = 22040640. Its totient is φ = 20706000.

The previous prime is 21368077. The next prime is 21368107. The reversal of 21368089 is 98086312.

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

It is a cyclic number.

It is not a de Polignac number, because 21368089 - 2¹¹ = 21366041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21368029) 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, 1639 + ... + 6739.

It is an arithmetic number, because the mean of its divisors is an integer number (2755080).

Almost surely, 2^21368089 is an apocalyptic number.

It is an amenable number.

21368089 is a deficient number, since it is larger than the sum of its proper divisors (672551).

21368089 is an equidigital number, since it uses as much as digits as its factorization.

21368089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5231.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 21368089 is about 4622.5630336427. The cubic root of 21368089 is about 277.4950419805.

The spelling of 21368089 in words is "twenty-one million, three hundred sixty-eight thousand, eighty-nine".