1321020011200 has 42 divisors (see below), whose sum is σ = 3250534868996. Its totient is φ = 528408003840.

The previous prime is 1321020011161. The next prime is 1321020011317. The reversal of 1321020011200 is 21100201231.

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, 412817154 + ... + 412820353.

Almost surely, 2^{1321020011200} is an apocalyptic number.

1321020011200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321020011200 is an abundant number, since it is smaller than the sum of its proper divisors (1929514857796).

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

1321020011200 is an equidigital number, since it uses as much as digits as its factorization.

1321020011200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825637529 (or 825637514 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1321020011200 its reverse (21100201231), we get a palindrome (1342120212431).

The spelling of 1321020011200 in words is "one trillion, three hundred twenty-one billion, twenty million, eleven thousand, two hundred".