1212121112200 has 48 divisors (see below), whose sum is σ = 2818620238500. Its totient is φ = 484772977920.

The previous prime is 1212121112179. The next prime is 1212121112201. The reversal of 1212121112200 is 22111212121.

It can be written as a sum of positive squares in 6 ways, for example, as 79671836644 + 1132449275556 = 282262^2 + 1064166^2 .

It is not an unprimeable number, because it can be changed into a prime (1212121112201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 825366 + ... + 1762234.

Almost surely, 2^{1212121112200} is an apocalyptic number.

1212121112200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212121112200 is an abundant number, since it is smaller than the sum of its proper divisors (1606499126300).

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

1212121112200 is a wasteful number, since it uses less digits than its factorization.

1212121112200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943354 (or 943345 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1212121112200 its reverse (22111212121), we get a palindrome (1234232324321).

The spelling of 1212121112200 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, one hundred twelve thousand, two hundred".