1211211221102 has 4 divisors (see below), whose sum is σ = 1816816831656. Its totient is φ = 605605610550.

The previous prime is 1211211221081. The next prime is 1211211221107. The reversal of 1211211221102 is 2011221121121.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211211221107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302802805274 + ... + 302802805277.

It is an arithmetic number, because the mean of its divisors is an integer number (454204207914).

Almost surely, 2^{1211211221102} is an apocalyptic number.

1211211221102 is a deficient number, since it is larger than the sum of its proper divisors (605605610554).

1211211221102 is an equidigital number, since it uses as much as digits as its factorization.

1211211221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605605610553.

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

Adding to 1211211221102 its reverse (2011221121121), we get a palindrome (3222432342223).

The spelling of 1211211221102 in words is "one trillion, two hundred eleven billion, two hundred eleven million, two hundred twenty-one thousand, one hundred two".