11111312100 has 144 divisors (see below), whose sum is σ = 38675302400. Its totient is φ = 2406049920.

The previous prime is 11111312099. The next prime is 11111312129. The reversal of 11111312100 is 121311111.

It is a super-2 number, since 2×11111312100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99340 + ... + 179139.

Almost surely, 2^11111312100 is an apocalyptic number.

11111312100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11111312100 is an abundant number, since it is smaller than the sum of its proper divisors (27563990300).

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

11111312100 is a wasteful number, since it uses less digits than its factorization.

11111312100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278522 (or 278515 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 11111312100 its reverse (121311111), we get a palindrome (11232623211).

The spelling of 11111312100 in words is "eleven billion, one hundred eleven million, three hundred twelve thousand, one hundred".