22222112021 has 4 divisors (see below), whose sum is σ = 22222580544. Its totient is φ = 22221643500.

The previous prime is 22222111997. The next prime is 22222112023. The reversal of 22222112021 is 12021122222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12021122222 = 2 ⋅6010561111.

It is a cyclic number.

It is not a de Polignac number, because 22222112021 - 2⁶ = 22222111957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222112023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153935 + ... + 261036.

It is an arithmetic number, because the mean of its divisors is an integer number (5555645136).

Almost surely, 2^22222112021 is an apocalyptic number.

It is an amenable number.

22222112021 is a deficient number, since it is larger than the sum of its proper divisors (468523).

22222112021 is an equidigital number, since it uses as much as digits as its factorization.

22222112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468522.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22222112021 its reverse (12021122222), we get a palindrome (34243234243).

The spelling of 22222112021 in words is "twenty-two billion, two hundred twenty-two million, one hundred twelve thousand, twenty-one".