1211221102 has 24 divisors (see below), whose sum is σ = 2276033256. Its totient is φ = 479163888.

The previous prime is 1211221097. The next prime is 1211221111. The reversal of 1211221102 is 2011221121.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 474088 + ... + 476635.

It is an arithmetic number, because the mean of its divisors is an integer number (94834719).

Almost surely, 2^1211221102 is an apocalyptic number.

1211221102 is a deficient number, since it is larger than the sum of its proper divisors (1064812154).

1211221102 is a wasteful number, since it uses less digits than its factorization.

1211221102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950752 (or 950745 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1211221102 is about 34802.6019429582. The cubic root of 1211221102 is about 1065.9605760371.

Adding to 1211221102 its reverse (2011221121), we get a palindrome (3222442223).

The spelling of 1211221102 in words is "one billion, two hundred eleven million, two hundred twenty-one thousand, one hundred two".