12221110021 has 2 divisors, whose sum is σ = 12221110022. Its totient is φ = 12221110020.

The previous prime is 12221109977. The next prime is 12221110039. The reversal of 12221110021 is 12001112221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11892993025 + 328116996 = 109055^2 + 18114^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221110021 - 2¹⁷ = 12220978949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221109983 and 12221110010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12201110021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110555010 + 6110555011.

It is an arithmetic number, because the mean of its divisors is an integer number (6110555011).

Almost surely, 2^12221110021 is an apocalyptic number.

It is an amenable number.

12221110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221110021 is an equidigital number, since it uses as much as digits as its factorization.

12221110021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12221110021 its reverse (12001112221), we get a palindrome (24222222242).

The spelling of 12221110021 in words is "twelve billion, two hundred twenty-one million, one hundred ten thousand, twenty-one".