12110021221 has 2 divisors, whose sum is σ = 12110021222. Its totient is φ = 12110021220.

The previous prime is 12110021171. The next prime is 12110021237. The reversal of 12110021221 is 12212001121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11027940196 + 1082081025 = 105014^2 + 32895^2 .

It is a cyclic number.

It is not a de Polignac number, because 12110021221 - 2¹⁵ = 12109988453 is a prime.

It is a super-2 number, since 2×12110021221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12110031221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055010610 + 6055010611.

It is an arithmetic number, because the mean of its divisors is an integer number (6055010611).

Almost surely, 2^12110021221 is an apocalyptic number.

It is an amenable number.

12110021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12110021221 is an equidigital number, since it uses as much as digits as its factorization.

12110021221 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 12110021221 its reverse (12212001121), we get a palindrome (24322022342).

The spelling of 12110021221 in words is "twelve billion, one hundred ten million, twenty-one thousand, two hundred twenty-one".