21766194 has 12 divisors (see below), whose sum is σ = 47160126. Its totient is φ = 7255392.

The previous prime is 21766183. The next prime is 21766219. The reversal of 21766194 is 49166712.

It can be written as a sum of positive squares in only one way, i.e., 21762225 + 3969 = 4665^2 + 63^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 604599 + ... + 604634.

Almost surely, 2^21766194 is an apocalyptic number.

21766194 is an abundant number, since it is smaller than the sum of its proper divisors (25393932).

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

21766194 is a wasteful number, since it uses less digits than its factorization.

21766194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209241 (or 1209238 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 21766194 is about 4665.4253825348. The cubic root of 21766194 is about 279.2077690824.

The spelling of 21766194 in words is "twenty-one million, seven hundred sixty-six thousand, one hundred ninety-four".