21650194 has 16 divisors (see below), whose sum is σ = 33105528. Its totient is φ = 10616832.

The previous prime is 21650191. The next prime is 21650201. The reversal of 21650194 is 49105612.

It can be written as a sum of positive squares in 4 ways, for example, as 19474569 + 2175625 = 4413^2 + 1475^2 .

It is not an unprimeable number, because it can be changed into a prime (21650191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37234 + ... + 37810.

Almost surely, 2^21650194 is an apocalyptic number.

21650194 is a deficient number, since it is larger than the sum of its proper divisors (11455334).

21650194 is a wasteful number, since it uses less digits than its factorization.

21650194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 21650194 is about 4652.9768965685. The cubic root of 21650194 is about 278.7108852729.

The spelling of 21650194 in words is "twenty-one million, six hundred fifty thousand, one hundred ninety-four".