1211220112021 has 2 divisors, whose sum is σ = 1211220112022. Its totient is φ = 1211220112020.

The previous prime is 1211220111967. The next prime is 1211220112043. The reversal of 1211220112021 is 1202110221121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1211078240100 + 141871921 = 1100490^2 + 11911^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211220112021 - 2¹⁹ = 1211219587733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211220111986 and 1211220112004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211220112121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605610056010 + 605610056011.

It is an arithmetic number, because the mean of its divisors is an integer number (605610056011).

Almost surely, 2^{1211220112021} is an apocalyptic number.

It is an amenable number.

1211220112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211220112021 is an equidigital number, since it uses as much as digits as its factorization.

1211220112021 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 1211220112021 its reverse (1202110221121), we get a palindrome (2413330333142).

The spelling of 1211220112021 in words is "one trillion, two hundred eleven billion, two hundred twenty million, one hundred twelve thousand, twenty-one".