21269965 has 8 divisors (see below), whose sum is σ = 25548768. Its totient is φ = 16999440.

The previous prime is 21269959. The next prime is 21269971. The reversal of 21269965 is 56996212.

It is an interprime number because it is at equal distance from previous prime (21269959) and next prime (21269971).

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

It is not a de Polignac number, because 21269965 - 2³ = 21269957 is a prime.

It is a super-2 number, since 2×21269965² = 904822822202450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8554 + ... + 10756.

It is an arithmetic number, because the mean of its divisors is an integer number (3193596).

Almost surely, 2^21269965 is an apocalyptic number.

It is an amenable number.

21269965 is a deficient number, since it is larger than the sum of its proper divisors (4278803).

21269965 is a wasteful number, since it uses less digits than its factorization.

21269965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139.

The product of its digits is 58320, while the sum is 40.

The square root of 21269965 is about 4611.9372285407. The cubic root of 21269965 is about 277.0696302166.

The spelling of 21269965 in words is "twenty-one million, two hundred sixty-nine thousand, nine hundred sixty-five".