21446465 has 16 divisors (see below), whose sum is σ = 27485568. Its totient is φ = 16025856.

The previous prime is 21446461. The next prime is 21446471. The reversal of 21446465 is 56464412.

It is a cyclic number.

It is not a de Polignac number, because 21446465 - 2² = 21446461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21446461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2777 + ... + 7113.

It is an arithmetic number, because the mean of its divisors is an integer number (1717848).

Almost surely, 2^21446465 is an apocalyptic number.

It is an amenable number.

21446465 is a deficient number, since it is larger than the sum of its proper divisors (6039103).

21446465 is a wasteful number, since it uses less digits than its factorization.

21446465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4408.

The product of its digits is 23040, while the sum is 32.

The square root of 21446465 is about 4631.0328221683. The cubic root of 21446465 is about 277.8339026444.

The spelling of 21446465 in words is "twenty-one million, four hundred forty-six thousand, four hundred sixty-five".