21774194 has 16 divisors (see below), whose sum is σ = 35752920. Its totient is φ = 9884160.

The previous prime is 21774187. The next prime is 21774197. The reversal of 21774194 is 49147712.

It can be written as a sum of positive squares in 4 ways, for example, as 7219969 + 14554225 = 2687^2 + 3815^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21774197) 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, 5279 + ... + 8450.

Almost surely, 2^21774194 is an apocalyptic number.

21774194 is a deficient number, since it is larger than the sum of its proper divisors (13978726).

21774194 is a wasteful number, since it uses less digits than its factorization.

21774194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13805.

The product of its digits is 14112, while the sum is 35.

The square root of 21774194 is about 4666.2826746780. The cubic root of 21774194 is about 279.2419717937.

The spelling of 21774194 in words is "twenty-one million, seven hundred seventy-four thousand, one hundred ninety-four".