21269369 has 8 divisors (see below), whose sum is σ = 23237760. Its totient is φ = 19306800.

The previous prime is 21269359. The next prime is 21269401. The reversal of 21269369 is 96396212.

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 21269369 - 2¹² = 21265273 is a prime.

It is a super-2 number, since 2×21269369² = 904772115316322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21269359) 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, 10499 + ... + 12359.

It is an arithmetic number, because the mean of its divisors is an integer number (2904720).

Almost surely, 2^21269369 is an apocalyptic number.

It is an amenable number.

21269369 is a deficient number, since it is larger than the sum of its proper divisors (1968391).

21269369 is a wasteful number, since it uses less digits than its factorization.

21269369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2911.

The product of its digits is 34992, while the sum is 38.

The square root of 21269369 is about 4611.8726131583. The cubic root of 21269369 is about 277.0670422944.

The spelling of 21269369 in words is "twenty-one million, two hundred sixty-nine thousand, three hundred sixty-nine".