21463973 has 8 divisors (see below), whose sum is σ = 22310400. Its totient is φ = 20624688.

The previous prime is 21463969. The next prime is 21463999. The reversal of 21463973 is 37936412.

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 21463973 - 2² = 21463969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21463933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4808 + ... + 8126.

It is an arithmetic number, because the mean of its divisors is an integer number (2788800).

Almost surely, 2^21463973 is an apocalyptic number.

It is an amenable number.

21463973 is a deficient number, since it is larger than the sum of its proper divisors (846427).

21463973 is a wasteful number, since it uses less digits than its factorization.

21463973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3571.

The product of its digits is 27216, while the sum is 35.

The square root of 21463973 is about 4632.9227276094. The cubic root of 21463973 is about 277.9094860858.

The spelling of 21463973 in words is "twenty-one million, four hundred sixty-three thousand, nine hundred seventy-three".