1211111102 has 4 divisors (see below), whose sum is σ = 1816666656. Its totient is φ = 605555550.

The previous prime is 1211111101. The next prime is 1211111107. The reversal of 1211111102 is 2011111121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2011111121 = 7477 ⋅268973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211111101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302777774 + ... + 302777777.

It is an arithmetic number, because the mean of its divisors is an integer number (454166664).

Almost surely, 2^1211111102 is an apocalyptic number.

1211111102 is a deficient number, since it is larger than the sum of its proper divisors (605555554).

1211111102 is an equidigital number, since it uses as much as digits as its factorization.

1211111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605555553.

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 1211111102 is about 34801.0215654656. The cubic root of 1211111102 is about 1065.9283057899.

Adding to 1211111102 its reverse (2011111121), we get a palindrome (3222222223).

The spelling of 1211111102 in words is "one billion, two hundred eleven million, one hundred eleven thousand, one hundred two".