1212210110021 has 2 divisors, whose sum is σ = 1212210110022. Its totient is φ = 1212210110020.

The previous prime is 1212210109987. The next prime is 1212210110051. The reversal of 1212210110021 is 1200110122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1088654344996 + 123555765025 = 1043386^2 + 351505^2 .

It is an emirp because it is prime and its reverse (1200110122121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212210110021 - 2³⁸ = 937332203077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212210109978 and 1212210110005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212210110051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105055010 + 606105055011.

It is an arithmetic number, because the mean of its divisors is an integer number (606105055011).

Almost surely, 2^{1212210110021} is an apocalyptic number.

It is an amenable number.

1212210110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212210110021 is an equidigital number, since it uses as much as digits as its factorization.

1212210110021 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 1212210110021 its reverse (1200110122121), we get a palindrome (2412320232142).

It can be divided in two parts, 12122101 and 10021, that multiplied together give a palindrome (121475574121).

The spelling of 1212210110021 in words is "one trillion, two hundred twelve billion, two hundred ten million, one hundred ten thousand, twenty-one".