22051966 has 4 divisors (see below), whose sum is σ = 33077952. Its totient is φ = 11025982.

The previous prime is 22051957. The next prime is 22051979. The reversal of 22051966 is 66915022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66915022 = 2 ⋅33457511.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5512990 + ... + 5512993.

It is an arithmetic number, because the mean of its divisors is an integer number (8269488).

Almost surely, 2^22051966 is an apocalyptic number.

22051966 is a deficient number, since it is larger than the sum of its proper divisors (11025986).

22051966 is a wasteful number, since it uses less digits than its factorization.

22051966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11025985.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 22051966 is about 4695.9520866380. The cubic root of 22051966 is about 280.4243819708.

Adding to 22051966 its reverse (66915022), we get a palindrome (88966988).

The spelling of 22051966 in words is "twenty-two million, fifty-one thousand, nine hundred sixty-six".