1212200020100 has 72 divisors (see below), whose sum is σ = 2748453337728. Its totient is φ = 463188140800.

The previous prime is 1212200020093. The next prime is 1212200020147. The reversal of 1212200020100 is 10200022121.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1404017 + ... + 2096583.

It is an arithmetic number, because the mean of its divisors is an integer number (38172963024).

Almost surely, 2^{1212200020100} is an apocalyptic number.

1212200020100 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 1212200020100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1374226668864).

1212200020100 is an abundant number, since it is smaller than the sum of its proper divisors (1536253317628).

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

1212200020100 is a wasteful number, since it uses less digits than its factorization.

1212200020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693365 (or 693358 counting only the distinct ones).

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

Adding to 1212200020100 its reverse (10200022121), we get a palindrome (1222400042221).

The spelling of 1212200020100 in words is "one trillion, two hundred twelve billion, two hundred million, twenty thousand, one hundred".