21464993 has 8 divisors (see below), whose sum is σ = 23738016. Its totient is φ = 19245600.

The previous prime is 21464987. The next prime is 21465013. The reversal of 21464993 is 39946412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21464993 - 2¹⁰ = 21463969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21464903) 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, 12563 + ... + 14168.

It is an arithmetic number, because the mean of its divisors is an integer number (2967252).

Almost surely, 2^21464993 is an apocalyptic number.

It is an amenable number.

21464993 is a deficient number, since it is larger than the sum of its proper divisors (2273023).

21464993 is a wasteful number, since it uses less digits than its factorization.

21464993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26815.

The product of its digits is 46656, while the sum is 38.

The square root of 21464993 is about 4633.0328079995. The cubic root of 21464993 is about 277.9138882405.

The spelling of 21464993 in words is "twenty-one million, four hundred sixty-four thousand, nine hundred ninety-three".