21344969 has 4 divisors (see below), whose sum is σ = 21865620. Its totient is φ = 20824320.

The previous prime is 21344951. The next prime is 21344987. The reversal of 21344969 is 96944312.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21344951) and next prime (21344987).

It can be written as a sum of positive squares in 2 ways, for example, as 11641744 + 9703225 = 3412^2 + 3115^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21344969 is a prime.

It is a super-2 number, since 2×21344969² = 911215403221922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344929) 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, 260264 + ... + 260345.

It is an arithmetic number, because the mean of its divisors is an integer number (5466405).

Almost surely, 2^21344969 is an apocalyptic number.

It is an amenable number.

21344969 is a deficient number, since it is larger than the sum of its proper divisors (520651).

21344969 is an equidigital number, since it uses as much as digits as its factorization.

21344969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520650.

The product of its digits is 46656, while the sum is 38.

The square root of 21344969 is about 4620.0615796762. The cubic root of 21344969 is about 277.3949238299.

The spelling of 21344969 in words is "twenty-one million, three hundred forty-four thousand, nine hundred sixty-nine".