12211111021 has 2 divisors, whose sum is σ = 12211111022. Its totient is φ = 12211111020.

The previous prime is 12211110979. The next prime is 12211111039. The reversal of 12211111021 is 12011111221.

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., 11763788521 + 447322500 = 108461^2 + 21150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211111021 is a prime.

It is a super-2 number, since 2×12211111021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12211110992 and 12211111010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211111051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105555510 + 6105555511.

It is an arithmetic number, because the mean of its divisors is an integer number (6105555511).

Almost surely, 2^12211111021 is an apocalyptic number.

It is an amenable number.

12211111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211111021 is an equidigital number, since it uses as much as digits as its factorization.

12211111021 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 12211111021 its reverse (12011111221), we get a palindrome (24222222242).

The spelling of 12211111021 in words is "twelve billion, two hundred eleven million, one hundred eleven thousand, twenty-one".