21794651 has 4 divisors (see below), whose sum is σ = 21806400. Its totient is φ = 21782904.

The previous prime is 21794627. The next prime is 21794671. The reversal of 21794651 is 15649712.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21794651 - 2²² = 17600347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21794611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2411 + ... + 7028.

It is an arithmetic number, because the mean of its divisors is an integer number (5451600).

Almost surely, 2^21794651 is an apocalyptic number.

21794651 is a deficient number, since it is larger than the sum of its proper divisors (11749).

21794651 is an equidigital number, since it uses as much as digits as its factorization.

21794651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11748.

The product of its digits is 15120, while the sum is 35.

The square root of 21794651 is about 4668.4741618649. The cubic root of 21794651 is about 279.3293943177.

The spelling of 21794651 in words is "twenty-one million, seven hundred ninety-four thousand, six hundred fifty-one".