1321210200 has 96 divisors (see below), whose sum is σ = 4113196560. Its totient is φ = 350822400.

The previous prime is 1321210193. The next prime is 1321210207. The reversal of 1321210200 is 20121231.

It is an interprime number because it is at equal distance from previous prime (1321210193) and next prime (1321210207).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321210207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 140032 + ... + 149168.

Almost surely, 2^1321210200 is an apocalyptic number.

1321210200 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 1321210200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2056598280).

1321210200 is an abundant number, since it is smaller than the sum of its proper divisors (2791986360).

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

1321210200 is a wasteful number, since it uses less digits than its factorization.

1321210200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9397 (or 9388 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1321210200 is about 36348.4552629132. The cubic root of 1321210200 is about 1097.2964461126.

Adding to 1321210200 its reverse (20121231), we get a palindrome (1341331431).

The spelling of 1321210200 in words is "one billion, three hundred twenty-one million, two hundred ten thousand, two hundred".