1331221200 has 60 divisors (see below), whose sum is σ = 4264349088. Its totient is φ = 354992000.

The previous prime is 1331221121. The next prime is 1331221231. The reversal of 1331221200 is 21221331.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1331221200.

It is a congruent number.

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, 553476 + ... + 555875.

Almost surely, 2^1331221200 is an apocalyptic number.

1331221200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331221200 is an abundant number, since it is smaller than the sum of its proper divisors (2933127888).

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

1331221200 is a wasteful number, since it uses less digits than its factorization.

1331221200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109372 (or 1109361 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1331221200 is about 36485.9041274846. The cubic root of 1331221200 is about 1100.0609332637.

Adding to 1331221200 its reverse (21221331), we get a palindrome (1352442531).

The spelling of 1331221200 in words is "one billion, three hundred thirty-one million, two hundred twenty-one thousand, two hundred".