21791694 has 16 divisors (see below), whose sum is σ = 43804800. Its totient is φ = 7227000.

The previous prime is 21791687. The next prime is 21791699. The reversal of 21791694 is 49619712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21791699) 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, 7932 + ... + 10319.

It is an arithmetic number, because the mean of its divisors is an integer number (2737800).

Almost surely, 2^21791694 is an apocalyptic number.

21791694 is an abundant number, since it is smaller than the sum of its proper divisors (22013106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21791694 is a wasteful number, since it uses less digits than its factorization.

21791694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18455.

The product of its digits is 27216, while the sum is 39.

The square root of 21791694 is about 4668.1574523574. The cubic root of 21791694 is about 279.3167610286.

The spelling of 21791694 in words is "twenty-one million, seven hundred ninety-one thousand, six hundred ninety-four".