21295969 has 4 divisors (see below), whose sum is σ = 21306544. Its totient is φ = 21285396.

The previous prime is 21295961. The next prime is 21295997. The reversal of 21295969 is 96959212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21295969 - 2³ = 21295961 is a prime.

It is a super-2 number, since 2×21295969² = 907036591297922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21295961) 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, 1227 + ... + 6640.

It is an arithmetic number, because the mean of its divisors is an integer number (5326636).

Almost surely, 2^21295969 is an apocalyptic number.

It is an amenable number.

21295969 is a deficient number, since it is larger than the sum of its proper divisors (10575).

21295969 is an equidigital number, since it uses as much as digits as its factorization.

21295969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10574.

The product of its digits is 87480, while the sum is 43.

The square root of 21295969 is about 4614.7555731588. The cubic root of 21295969 is about 277.1824964811.

The spelling of 21295969 in words is "twenty-one million, two hundred ninety-five thousand, nine hundred sixty-nine".