21622234 has 4 divisors (see below), whose sum is σ = 32433354. Its totient is φ = 10811116.

The previous prime is 21622219. The next prime is 21622241. The reversal of 21622234 is 43222612.

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., 16769025 + 4853209 = 4095^2 + 2203^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5405557 + ... + 5405560.

Almost surely, 2^21622234 is an apocalyptic number.

21622234 is a deficient number, since it is larger than the sum of its proper divisors (10811120).

21622234 is a wasteful number, since it uses less digits than its factorization.

21622234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10811119.

The product of its digits is 1152, while the sum is 22.

The square root of 21622234 is about 4649.9713977615. The cubic root of 21622234 is about 278.5908538096.

Adding to 21622234 its reverse (43222612), we get a palindrome (64844846).

The spelling of 21622234 in words is "twenty-one million, six hundred twenty-two thousand, two hundred thirty-four".