21382269 has 16 divisors (see below), whose sum is σ = 29146944. Its totient is φ = 13939200.

The previous prime is 21382247. The next prime is 21382271. The reversal of 21382269 is 96228312.

It is a happy number.

It is not a de Polignac number, because 21382269 - 2¹⁹ = 20857981 is a prime.

It is a super-2 number, since 2×21382269² = 914402855176722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21382069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60397 + ... + 60749.

It is an arithmetic number, because the mean of its divisors is an integer number (1821684).

Almost surely, 2^21382269 is an apocalyptic number.

It is an amenable number.

21382269 is a deficient number, since it is larger than the sum of its proper divisors (7764675).

21382269 is a wasteful number, since it uses less digits than its factorization.

21382269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748.

The product of its digits is 10368, while the sum is 33.

The square root of 21382269 is about 4624.0965604105. The cubic root of 21382269 is about 277.5564109002.

The spelling of 21382269 in words is "twenty-one million, three hundred eighty-two thousand, two hundred sixty-nine".