12211001210021 has 2 divisors, whose sum is σ = 12211001210022. Its totient is φ = 12211001210020.

The previous prime is 12211001210017. The next prime is 12211001210053. The reversal of 12211001210021 is 12001210011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8651039800225 + 3559961409796 = 2941265^2 + 1886786^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211001210021 - 2² = 12211001210017 is a prime.

It is a super-2 number, since 2×12211001210021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12211001209978 and 12211001210005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12211001210011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105500605010 + 6105500605011.

It is an arithmetic number, because the mean of its divisors is an integer number (6105500605011).

Almost surely, 2^{12211001210021} is an apocalyptic number.

It is an amenable number.

12211001210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211001210021 is an equidigital number, since it uses as much as digits as its factorization.

12211001210021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12211001210021 its reverse (12001210011221), we get a palindrome (24212211221242).

The spelling of 12211001210021 in words is "twelve trillion, two hundred eleven billion, one million, two hundred ten thousand, twenty-one".