1221121211122 has 4 divisors (see below), whose sum is σ = 1831681816686. Its totient is φ = 610560605560.

The previous prime is 1221121211099. The next prime is 1221121211147. The reversal of 1221121211122 is 2211121211221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1016590244121 + 204530967001 = 1008261^2 + 452251^2 .

It is a super-3 number, since 3×1221121211122³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1221121211122.

It is an unprimeable number.

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, 305280302779 + ... + 305280302782.

Almost surely, 2^{1221121211122} is an apocalyptic number.

1221121211122 is a deficient number, since it is larger than the sum of its proper divisors (610560605564).

1221121211122 is an equidigital number, since it uses as much as digits as its factorization.

1221121211122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610560605563.

The product of its digits is 64, while the sum is 19.

Adding to 1221121211122 its reverse (2211121211221), we get a palindrome (3432242422343).

Subtracting 1221121211122 from its reverse (2211121211221), we obtain a palindrome (990000000099).

The spelling of 1221121211122 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twenty-two".