22812021 has 24 divisors (see below), whose sum is σ = 34622016. Its totient is φ = 14446080.

The previous prime is 22812019. The next prime is 22812029. The reversal of 22812021 is 12021822.

It is a happy number.

It is not a de Polignac number, because 22812021 - 2¹ = 22812019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22811985 and 22812003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22812029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39666 + ... + 40236.

It is an arithmetic number, because the mean of its divisors is an integer number (1442584).

Almost surely, 2^22812021 is an apocalyptic number.

It is an amenable number.

22812021 is a deficient number, since it is larger than the sum of its proper divisors (11809995).

22812021 is a wasteful number, since it uses less digits than its factorization.

22812021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 22812021 is about 4776.1931493607. The cubic root of 22812021 is about 283.6098134721.

Adding to 22812021 its reverse (12021822), we get a palindrome (34833843).

The spelling of 22812021 in words is "twenty-two million, eight hundred twelve thousand, twenty-one".