22222212021 has 6 divisors (see below), whose sum is σ = 32098750710. Its totient is φ = 14814808008.

The previous prime is 22222211981. The next prime is 22222212029. The reversal of 22222212021 is 12021222222.

It can be written as a sum of positive squares in only one way, i.e., 16432676100 + 5789535921 = 128190^2 + 76089^2 .

It is not a de Polignac number, because 22222212021 - 2⁹ = 22222211509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22222211985 and 22222212003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222212029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1234567326 + ... + 1234567343.

It is an arithmetic number, because the mean of its divisors is an integer number (5349791785).

Almost surely, 2^22222212021 is an apocalyptic number.

It is an amenable number.

22222212021 is a deficient number, since it is larger than the sum of its proper divisors (9876538689).

22222212021 is a wasteful number, since it uses less digits than its factorization.

22222212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2469134675 (or 2469134672 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22222212021 its reverse (12021222222), we get a palindrome (34243434243).

The spelling of 22222212021 in words is "twenty-two billion, two hundred twenty-two million, two hundred twelve thousand, twenty-one".