21896465 has 8 divisors (see below), whose sum is σ = 26517480. Its totient is φ = 17356032.

The previous prime is 21896453. The next prime is 21896477. The reversal of 21896465 is 56469812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21896453) and next prime (21896477).

It can be written as a sum of positive squares in 4 ways, for example, as 8994001 + 12902464 = 2999^2 + 3592^2 .

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 21896465 - 2⁴ = 21896449 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19544 + ... + 20633.

It is an arithmetic number, because the mean of its divisors is an integer number (3314685).

Almost surely, 2^21896465 is an apocalyptic number.

It is an amenable number.

21896465 is a deficient number, since it is larger than the sum of its proper divisors (4621015).

21896465 is a wasteful number, since it uses less digits than its factorization.

21896465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40291.

The product of its digits is 103680, while the sum is 41.

The square root of 21896465 is about 4679.3658758426. The cubic root of 21896465 is about 279.7636824088.

The spelling of 21896465 in words is "twenty-one million, eight hundred ninety-six thousand, four hundred sixty-five".