1212121113100 has 18 divisors (see below), whose sum is σ = 2630302815644. Its totient is φ = 484848445200.

The previous prime is 1212121113089. The next prime is 1212121113109. The reversal of 1212121113100 is 13111212121.

It is a happy number.

It is a super-2 number, since 2×1212121113100² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212121113109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6060605466 + ... + 6060605665.

Almost surely, 2^{1212121113100} is an apocalyptic number.

1212121113100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212121113100 is an abundant number, since it is smaller than the sum of its proper divisors (1418181702544).

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

1212121113100 is a wasteful number, since it uses less digits than its factorization.

1212121113100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12121211145 (or 12121211138 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1212121113100 its reverse (13111212121), we get a palindrome (1225232325221).

The spelling of 1212121113100 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, one hundred thirteen thousand, one hundred".