1212120200021 has 2 divisors, whose sum is σ = 1212120200022. Its totient is φ = 1212120200020.

The previous prime is 1212120199993. The next prime is 1212120200047. The reversal of 1212120200021 is 1200020212121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190837475025 + 21282724996 = 1091255^2 + 145886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212120200021 - 2²⁶ = 1212053091157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212120199969 and 1212120200005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212120206021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606060100010 + 606060100011.

It is an arithmetic number, because the mean of its divisors is an integer number (606060100011).

Almost surely, 2^{1212120200021} is an apocalyptic number.

It is an amenable number.

1212120200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212120200021 is an equidigital number, since it uses as much as digits as its factorization.

1212120200021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1212120200021 its reverse (1200020212121), we get a palindrome (2412140412142).

It can be divided in two parts, 1212120 and 200021, that added together give a palindrome (1412141).

The spelling of 1212120200021 in words is "one trillion, two hundred twelve billion, one hundred twenty million, two hundred thousand, twenty-one".