1211111112100 has 72 divisors (see below), whose sum is σ = 2689596132608. Its totient is φ = 473113872000.

The previous prime is 1211111112019. The next prime is 1211111112131. The reversal of 1211111112100 is 12111111121.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42560077 + ... + 42588523.

Almost surely, 2^{1211111112100} is an apocalyptic number.

1211111112100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211111112100 is an abundant number, since it is smaller than the sum of its proper divisors (1478485020508).

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

1211111112100 is a wasteful number, since it uses less digits than its factorization.

1211111112100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38405 (or 38398 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1211111112100 its reverse (12111111121), we get a palindrome (1223222223221).

1211111112100 divided by its reverse (12111111121) gives a square (100 = 10²).

The spelling of 1211111112100 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred twelve thousand, one hundred".