12121020200 has 72 divisors (see below), whose sum is σ = 28397368650. Its totient is φ = 4811527680.

The previous prime is 12121020169. The next prime is 12121020251. The reversal of 12121020200 is 202012121.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 663886756 + 11457133444 = 25766^2 + 107038^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3752186 + ... + 3755414.

Almost surely, 2^12121020200 is an apocalyptic number.

12121020200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12121020200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14198684325).

12121020200 is an abundant number, since it is smaller than the sum of its proper divisors (16276348450).

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

12121020200 is a wasteful number, since it uses less digits than its factorization.

12121020200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3519 (or 3373 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12121020200 its reverse (202012121), we get a palindrome (12323032321).

The spelling of 12121020200 in words is "twelve billion, one hundred twenty-one million, twenty thousand, two hundred".