21896469 has 12 divisors (see below), whose sum is σ = 36146656. Its totient is φ = 12512232.

The previous prime is 21896453. The next prime is 21896477. The reversal of 21896469 is 96469812.

It is a happy number.

21896469 is a `hidden beast` number, since 2 + 189 + 6 + 469 = 666.

It is not a de Polignac number, because 21896469 - 2⁴ = 21896453 is a prime.

It is a super-2 number, since 2×21896469² = 958910709335922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21896449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173719 + ... + 173844.

Almost surely, 2^21896469 is an apocalyptic number.

It is an amenable number.

21896469 is a deficient number, since it is larger than the sum of its proper divisors (14250187).

21896469 is a wasteful number, since it uses less digits than its factorization.

21896469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347576 (or 347573 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 21896469 is about 4679.3663032509. The cubic root of 21896469 is about 279.7636994444.

The spelling of 21896469 in words is "twenty-one million, eight hundred ninety-six thousand, four hundred sixty-nine".