22222121021 has 8 divisors (see below), whose sum is σ = 22609972800. Its totient is φ = 21834642880.

The previous prime is 22222120997. The next prime is 22222121027. The reversal of 22222121021 is 12012122222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22222121021 - 2²⁶ = 22155012157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222121027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27941 + ... + 212661.

It is an arithmetic number, because the mean of its divisors is an integer number (2826246600).

Almost surely, 2^22222121021 is an apocalyptic number.

It is an amenable number.

22222121021 is a deficient number, since it is larger than the sum of its proper divisors (387851779).

22222121021 is a wasteful number, since it uses less digits than its factorization.

22222121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186819.

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

Adding to 22222121021 its reverse (12012122222), we get a palindrome (34234243243).

The spelling of 22222121021 in words is "twenty-two billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty-one".