21395794 has 32 divisors (see below), whose sum is σ = 38304000. Its totient is φ = 8769600.

The previous prime is 21395791. The next prime is 21395821. The reversal of 21395794 is 49759312.

It is not an unprimeable number, because it can be changed into a prime (21395791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61132 + ... + 61480.

It is an arithmetic number, because the mean of its divisors is an integer number (1197000).

Almost surely, 2^21395794 is an apocalyptic number.

21395794 is a deficient number, since it is larger than the sum of its proper divisors (16908206).

21395794 is a wasteful number, since it uses less digits than its factorization.

21395794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538.

The product of its digits is 68040, while the sum is 40.

The square root of 21395794 is about 4625.5587770560. The cubic root of 21395794 is about 277.6149198021.

The spelling of 21395794 in words is "twenty-one million, three hundred ninety-five thousand, seven hundred ninety-four".