22942821 has 32 divisors (see below), whose sum is σ = 35352576. Its totient is φ = 13104000.

The previous prime is 22942793. The next prime is 22942837. The reversal of 22942821 is 12824922.

It is not a de Polignac number, because 22942821 - 2¹⁴ = 22926437 is a prime.

It is a Smith number, since the sum of its digits (30) 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 not an unprimeable number, because it can be changed into a prime (22942841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41670 + ... + 42216.

It is an arithmetic number, because the mean of its divisors is an integer number (1104768).

Almost surely, 2^22942821 is an apocalyptic number.

It is an amenable number.

22942821 is a deficient number, since it is larger than the sum of its proper divisors (12409755).

22942821 is a wasteful number, since it uses less digits than its factorization.

22942821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633.

The product of its digits is 4608, while the sum is 30.

The square root of 22942821 is about 4789.8664908325. The cubic root of 22942821 is about 284.1508365245.

It can be divided in two parts, 2294 and 2821, that added together give a palindrome (5115).

The spelling of 22942821 in words is "twenty-two million, nine hundred forty-two thousand, eight hundred twenty-one".