1211111220122 has 4 divisors (see below), whose sum is σ = 1816666830186. Its totient is φ = 605555610060.

The previous prime is 1211111220097. The next prime is 1211111220167. The reversal of 1211111220122 is 2210221111121.

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., 1177873919401 + 33237300721 = 1085299^2 + 182311^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1211111220122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302777805029 + ... + 302777805032.

Almost surely, 2^{1211111220122} is an apocalyptic number.

1211111220122 is a deficient number, since it is larger than the sum of its proper divisors (605555610064).

1211111220122 is an equidigital number, since it uses as much as digits as its factorization.

1211111220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605555610063.

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

Adding to 1211111220122 its reverse (2210221111121), we get a palindrome (3421332331243).

The spelling of 1211111220122 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred twenty thousand, one hundred twenty-two".