21882194 has 4 divisors (see below), whose sum is σ = 32823294. Its totient is φ = 10941096.

The previous prime is 21882191. The next prime is 21882197. The reversal of 21882194 is 49128812.

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

It is an interprime number because it is at equal distance from previous prime (21882191) and next prime (21882197).

It can be written as a sum of positive squares in only one way, i.e., 21855625 + 26569 = 4675^2 + 163^2 .

It is not an unprimeable number, because it can be changed into a prime (21882191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5470547 + ... + 5470550.

Almost surely, 2^21882194 is an apocalyptic number.

21882194 is a deficient number, since it is larger than the sum of its proper divisors (10941100).

21882194 is a wasteful number, since it uses less digits than its factorization.

21882194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10941099.

The product of its digits is 9216, while the sum is 35.

The square root of 21882194 is about 4677.8407411967. The cubic root of 21882194 is about 279.7028906296.

The spelling of 21882194 in words is "twenty-one million, eight hundred eighty-two thousand, one hundred ninety-four".