1211113100 has 36 divisors (see below), whose sum is σ = 2639742504. Its totient is φ = 482302080.

The previous prime is 1211113097. The next prime is 1211113117. The reversal of 1211113100 is 13111121.

It is a happy number.

It is a super-2 number, since 2×1211113100² = 2933589881983220000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3977 + ... + 49376.

Almost surely, 2^1211113100 is an apocalyptic number.

1211113100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211113100 is an abundant number, since it is smaller than the sum of its proper divisors (1428629404).

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

1211113100 is a wasteful number, since it uses less digits than its factorization.

1211113100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53594 (or 53587 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 1211113100 is about 34801.0502715076. The cubic root of 1211113100 is about 1065.9288919523.

Adding to 1211113100 its reverse (13111121), we get a palindrome (1224224221).

The spelling of 1211113100 in words is "one billion, two hundred eleven million, one hundred thirteen thousand, one hundred".