1211100102 has 12 divisors (see below), whose sum is σ = 2624050260. Its totient is φ = 403700028.

The previous prime is 1211100101. The next prime is 1211100113. The reversal of 1211100102 is 2010011121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211100101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33641652 + ... + 33641687.

It is an arithmetic number, because the mean of its divisors is an integer number (218670855).

Almost surely, 2^1211100102 is an apocalyptic number.

1211100102 is an abundant number, since it is smaller than the sum of its proper divisors (1412950158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211100102 is a wasteful number, since it uses less digits than its factorization.

1211100102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67283347 (or 67283344 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1211100102 is about 34800.8635237691. The cubic root of 1211100102 is about 1065.9250786577.

Adding to 1211100102 its reverse (2010011121), we get a palindrome (3221111223).

The spelling of 1211100102 in words is "one billion, two hundred eleven million, one hundred thousand, one hundred two".