21344089 has 8 divisors (see below), whose sum is σ = 23727872. Its totient is φ = 19066320.

The previous prime is 21344077. The next prime is 21344093. The reversal of 21344089 is 98044312.

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

It is a de Polignac number, because none of the positive numbers 2^k-21344089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

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 21344089.

It is not an unprimeable number, because it can be changed into a prime (21324089) 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, 26079 + ... + 26884.

It is an arithmetic number, because the mean of its divisors is an integer number (2965984).

Almost surely, 2^21344089 is an apocalyptic number.

It is an amenable number.

21344089 is a deficient number, since it is larger than the sum of its proper divisors (2383783).

21344089 is a wasteful number, since it uses less digits than its factorization.

21344089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53007.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21344089 is about 4619.9663418687. The cubic root of 21344089 is about 277.3911116765.

The spelling of 21344089 in words is "twenty-one million, three hundred forty-four thousand, eighty-nine".