22821142 has 4 divisors (see below), whose sum is σ = 34231716. Its totient is φ = 11410570.

The previous prime is 22821131. The next prime is 22821163. The reversal of 22821142 is 24112822.

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

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 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, 5705284 + ... + 5705287.

It is an arithmetic number, because the mean of its divisors is an integer number (8557929).

Almost surely, 2^22821142 is an apocalyptic number.

22821142 is a deficient number, since it is larger than the sum of its proper divisors (11410574).

22821142 is a wasteful number, since it uses less digits than its factorization.

22821142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11410573.

The product of its digits is 512, while the sum is 22.

The square root of 22821142 is about 4777.1478938798. The cubic root of 22821142 is about 283.6476072947.

Adding to 22821142 its reverse (24112822), we get a palindrome (46933964).

The spelling of 22821142 in words is "twenty-two million, eight hundred twenty-one thousand, one hundred forty-two".