21828194 has 4 divisors (see below), whose sum is σ = 32742294. Its totient is φ = 10914096.

The previous prime is 21828167. The next prime is 21828197. The reversal of 21828194 is 49182812.

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

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 1352569 = 4525^2 + 1163^2 .

It is not an unprimeable number, because it can be changed into a prime (21828197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5457047 + ... + 5457050.

Almost surely, 2^21828194 is an apocalyptic number.

21828194 is a deficient number, since it is larger than the sum of its proper divisors (10914100).

21828194 is a wasteful number, since it uses less digits than its factorization.

21828194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10914099.

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

The square root of 21828194 is about 4672.0652820782. The cubic root of 21828194 is about 279.4726212537.

It can be divided in two parts, 21828 and 194, that added together give a palindrome (22022).

The spelling of 21828194 in words is "twenty-one million, eight hundred twenty-eight thousand, one hundred ninety-four".