21694126 has 4 divisors (see below), whose sum is σ = 32541192. Its totient is φ = 10847062.

The previous prime is 21694069. The next prime is 21694133. The reversal of 21694126 is 62149612.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5423530 + ... + 5423533.

It is an arithmetic number, because the mean of its divisors is an integer number (8135298).

Almost surely, 2^21694126 is an apocalyptic number.

21694126 is a deficient number, since it is larger than the sum of its proper divisors (10847066).

21694126 is a wasteful number, since it uses less digits than its factorization.

21694126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10847065.

The product of its digits is 5184, while the sum is 31.

The square root of 21694126 is about 4657.6953528542. The cubic root of 21694126 is about 278.8992754859.

The spelling of 21694126 in words is "twenty-one million, six hundred ninety-four thousand, one hundred twenty-six".