1211022112221 has 8 divisors (see below), whose sum is σ = 1794106832960. Its totient is φ = 807348074796.

The previous prime is 1211022112211. The next prime is 1211022112231. The reversal of 1211022112221 is 1222112201121.

1211022112221 is a `hidden beast` number, since 1 + 211 + 0 + 221 + 12 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (1211022112211) and next prime (1211022112231).

It is not a de Polignac number, because 1211022112221 - 2⁹ = 1211022111709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211022112194 and 1211022112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211022112211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22426335385 + ... + 22426335438.

It is an arithmetic number, because the mean of its divisors is an integer number (224263354120).

Almost surely, 2^{1211022112221} is an apocalyptic number.

It is an amenable number.

1211022112221 is a deficient number, since it is larger than the sum of its proper divisors (583084720739).

1211022112221 is an equidigital number, since it uses as much as digits as its factorization.

1211022112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44852670832 (or 44852670826 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1211022112221 its reverse (1222112201121), we get a palindrome (2433134313342).

The spelling of 1211022112221 in words is "one trillion, two hundred eleven billion, twenty-two million, one hundred twelve thousand, two hundred twenty-one".