22233221221 has 2 divisors, whose sum is σ = 22233221222. Its totient is φ = 22233221220.

The previous prime is 22233221201. The next prime is 22233221237. The reversal of 22233221221 is 12212233222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11205281025 + 11027940196 = 105855^2 + 105014^2 .

It is a cyclic number.

It is not a de Polignac number, because 22233221221 - 2⁷ = 22233221093 is a prime.

It is a super-2 number, since 2×22233221221² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22233221192 and 22233221201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22233221201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11116610610 + 11116610611.

It is an arithmetic number, because the mean of its divisors is an integer number (11116610611).

Almost surely, 2^22233221221 is an apocalyptic number.

It is an amenable number.

22233221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22233221221 is an equidigital number, since it uses as much as digits as its factorization.

22233221221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 22.

Adding to 22233221221 its reverse (12212233222), we get a palindrome (34445454443).

The spelling of 22233221221 in words is "twenty-two billion, two hundred thirty-three million, two hundred twenty-one thousand, two hundred twenty-one".