21415793 has 12 divisors (see below), whose sum is σ = 26224560. Its totient is φ = 17389512.

The previous prime is 21415789. The next prime is 21415811. The reversal of 21415793 is 39751412.

It is not a de Polignac number, because 21415793 - 2² = 21415789 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21415753) 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 11 ways as a sum of consecutive naturals, for example, 10571 + ... + 12432.

It is an arithmetic number, because the mean of its divisors is an integer number (2185380).

Almost surely, 2^21415793 is an apocalyptic number.

It is an amenable number.

21415793 is a deficient number, since it is larger than the sum of its proper divisors (4808767).

21415793 is a wasteful number, since it uses less digits than its factorization.

21415793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23036 (or 23029 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 21415793 is about 4627.7200649996. The cubic root of 21415793 is about 277.7013899407.

The spelling of 21415793 in words is "twenty-one million, four hundred fifteen thousand, seven hundred ninety-three".