1212121232100 has 108 divisors (see below), whose sum is σ = 3902011273524. Its totient is φ = 314496311040.

The previous prime is 1212121232089. The next prime is 1212121232129. The reversal of 1212121232100 is 12321212121.

1212121232100 is a `hidden beast` number, since 1 + 212 + 121 + 232 + 100 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 70381967616 + 1141739264484 = 265296^2 + 1068522^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18166719 + ... + 18233318.

Almost surely, 2^{1212121232100} is an apocalyptic number.

1212121232100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212121232100 is an abundant number, since it is smaller than the sum of its proper divisors (2689890041424).

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

1212121232100 is a wasteful number, since it uses less digits than its factorization.

1212121232100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36400094 (or 36400084 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 1212121232100 its reverse (12321212121), we get a palindrome (1224442444221).

The spelling of 1212121232100 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred thirty-two thousand, one hundred".