1212221200 has 30 divisors (see below), whose sum is σ = 2912362394. Its totient is φ = 484888320.

The previous prime is 1212221191. The next prime is 1212221221. The reversal of 1212221200 is 21222121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 74373376 + 1137847824 = 8624^2 + 33732^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1514877 + ... + 1515676.

Almost surely, 2^1212221200 is an apocalyptic number.

1212221200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212221200 is an abundant number, since it is smaller than the sum of its proper divisors (1700141194).

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

1212221200 is a wasteful number, since it uses less digits than its factorization.

1212221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030571 (or 3030560 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1212221200 is about 34816.9671281115. The cubic root of 1212221200 is about 1066.2538810768.

Adding to 1212221200 its reverse (21222121), we get a palindrome (1233443321).

The spelling of 1212221200 in words is "one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred".