1212112222100 has 72 divisors (see below), whose sum is σ = 2832807938688. Its totient is φ = 447518332800.

The previous prime is 1212112222051. The next prime is 1212112222103. The reversal of 1212112222100 is 12222112121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212112222103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28900145 + ... + 28942055.

It is an arithmetic number, because the mean of its divisors is an integer number (39344554704).

Almost surely, 2^{1212112222100} is an apocalyptic number.

1212112222100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212112222100 is an abundant number, since it is smaller than the sum of its proper divisors (1620695716588).

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

1212112222100 is a wasteful number, since it uses less digits than its factorization.

1212112222100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64185 (or 64178 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1212112222100 its reverse (12222112121), we get a palindrome (1224334334221).

The spelling of 1212112222100 in words is "one trillion, two hundred twelve billion, one hundred twelve million, two hundred twenty-two thousand, one hundred".