1212210211021 has 2 divisors, whose sum is σ = 1212210211022. Its totient is φ = 1212210211020.

The previous prime is 1212210211013. The next prime is 1212210211027. The reversal of 1212210211021 is 1201120122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 764496666025 + 447713544996 = 874355^2 + 669114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212210211021 - 2³ = 1212210211013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212210210986 and 1212210211004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212210211027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105105510 + 606105105511.

It is an arithmetic number, because the mean of its divisors is an integer number (606105105511).

Almost surely, 2^{1212210211021} is an apocalyptic number.

It is an amenable number.

1212210211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212210211021 is an equidigital number, since it uses as much as digits as its factorization.

1212210211021 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 16.

Adding to 1212210211021 its reverse (1201120122121), we get a palindrome (2413330333142).

The spelling of 1212210211021 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred eleven thousand, twenty-one".