1221200200 has 48 divisors (see below), whose sum is σ = 3097413360. Its totient is φ = 444072000.

The previous prime is 1221200161. The next prime is 1221200273. The reversal of 1221200200 is 20021221.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 275346 + ... + 279745.

It is an arithmetic number, because the mean of its divisors is an integer number (64529445).

Almost surely, 2^1221200200 is an apocalyptic number.

1221200200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221200200 is an abundant number, since it is smaller than the sum of its proper divisors (1876213160).

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

1221200200 is a wasteful number, since it uses less digits than its factorization.

1221200200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555118 (or 555109 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1221200200 is about 34945.6749827500. The cubic root of 1221200200 is about 1068.8800113146.

Adding to 1221200200 its reverse (20021221), we get a palindrome (1241221421).

It can be divided in two parts, 12 and 21200200, that added together give a palindrome (21200212).

The spelling of 1221200200 in words is "one billion, two hundred twenty-one million, two hundred thousand, two hundred".