1211221112102 has 4 divisors (see below), whose sum is σ = 1816831668156. Its totient is φ = 605610556050.

The previous prime is 1211221112089. The next prime is 1211221112107. The reversal of 1211221112102 is 2012111221121.

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 (1211221112107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302805278024 + ... + 302805278027.

It is an arithmetic number, because the mean of its divisors is an integer number (454207917039).

Almost surely, 2^{1211221112102} is an apocalyptic number.

1211221112102 is a deficient number, since it is larger than the sum of its proper divisors (605610556054).

1211221112102 is an equidigital number, since it uses as much as digits as its factorization.

1211221112102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605610556053.

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

Adding to 1211221112102 its reverse (2012111221121), we get a palindrome (3223332333223).

The spelling of 1211221112102 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, one hundred two".