22111111021 has 2 divisors, whose sum is σ = 22111111022. Its totient is φ = 22111111020.

The previous prime is 22111110971. The next prime is 22111111069. The reversal of 22111111021 is 12011111122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18601140996 + 3509970025 = 136386^2 + 59245^2 .

It is a cyclic number.

It is not a de Polignac number, because 22111111021 - 2⁷ = 22111110893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22111110992 and 22111111010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22111141021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11055555510 + 11055555511.

It is an arithmetic number, because the mean of its divisors is an integer number (11055555511).

Almost surely, 2^22111111021 is an apocalyptic number.

It is an amenable number.

22111111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22111111021 is an equidigital number, since it uses as much as digits as its factorization.

22111111021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 22111111021 its reverse (12011111122), we get a palindrome (34122222143).

The spelling of 22111111021 in words is "twenty-two billion, one hundred eleven million, one hundred eleven thousand, twenty-one".