1211122110100 has 36 divisors (see below), whose sum is σ = 3003582834784. Its totient is φ = 415241866080.

The previous prime is 1211122110089. The next prime is 1211122110137. The reversal of 1211122110100 is 10112211121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 865086522 + ... + 865087921.

Almost surely, 2^{1211122110100} is an apocalyptic number.

1211122110100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211122110100 is an abundant number, since it is smaller than the sum of its proper divisors (1792460724684).

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

1211122110100 is a wasteful number, since it uses less digits than its factorization.

1211122110100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730174464 (or 1730174457 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1211122110100 its reverse (10112211121), we get a palindrome (1221234321221).

The spelling of 1211122110100 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, one hundred ten thousand, one hundred".