1222122200 has 192 divisors, whose sum is σ = 3191045760. Its totient is φ = 432414720.

The previous prime is 1222122193. The next prime is 1222122211. The reversal of 1222122200 is 22212221.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8920532 + ... + 8920668.

It is an arithmetic number, because the mean of its divisors is an integer number (16620030).

Almost surely, 2^1222122200 is an apocalyptic number.

1222122200 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 1222122200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1595522880).

1222122200 is an abundant number, since it is smaller than the sum of its proper divisors (1968923560).

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

1222122200 is a wasteful number, since it uses less digits than its factorization.

1222122200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1222122200 is about 34958.8643980322. The cubic root of 1222122200 is about 1069.1489433201.

Adding to 1222122200 its reverse (22212221), we get a palindrome (1244334421).

It can be divided in two parts, 1222 and 122200, that multiplied together give a square (149328400 = 12220²).

The spelling of 1222122200 in words is "one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred".