21344269 has 4 divisors (see below), whose sum is σ = 21359520. Its totient is φ = 21329020.

The previous prime is 21344249. The next prime is 21344273. The reversal of 21344269 is 96244312.

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.

It is a cyclic number.

It is not a de Polignac number, because 21344269 - 2⁵ = 21344237 is a prime.

It is a super-2 number, since 2×21344269² = 911155638288722, which contains 22 as substring.

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 21344269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344209) 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, 5287 + ... + 8404.

It is an arithmetic number, because the mean of its divisors is an integer number (5339880).

Almost surely, 2^21344269 is an apocalyptic number.

It is an amenable number.

21344269 is a deficient number, since it is larger than the sum of its proper divisors (15251).

21344269 is a wasteful number, since it uses less digits than its factorization.

21344269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15250.

The product of its digits is 10368, while the sum is 31.

The square root of 21344269 is about 4619.9858224891. The cubic root of 21344269 is about 277.3918914437.

It can be divided in two parts, 2134 and 4269, that multiplied together give a triangular number (9110046 = T₄₂₆₈).

The spelling of 21344269 in words is "twenty-one million, three hundred forty-four thousand, two hundred sixty-nine".