1212112011221 has 4 divisors (see below), whose sum is σ = 1264812533472. Its totient is φ = 1159411488972.

The previous prime is 1212112011181. The next prime is 1212112011223. The reversal of 1212112011221 is 1221102112121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1212112011221 - 2⁶ = 1212112011157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212112011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212112011223) 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 in 3 ways as a sum of consecutive naturals, for example, 26350261091 + ... + 26350261136.

It is an arithmetic number, because the mean of its divisors is an integer number (316203133368).

Almost surely, 2^{1212112011221} is an apocalyptic number.

It is an amenable number.

1212112011221 is a deficient number, since it is larger than the sum of its proper divisors (52700522251).

1212112011221 is an equidigital number, since it uses as much as digits as its factorization.

1212112011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52700522250.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1212112011221 its reverse (1221102112121), we get a palindrome (2433214123342).

The spelling of 1212112011221 in words is "one trillion, two hundred twelve billion, one hundred twelve million, eleven thousand, two hundred twenty-one".