1221331320300 has 144 divisors (see below), whose sum is σ = 4349192244992. Its totient is φ = 257687481600.

The previous prime is 1221331320211. The next prime is 1221331320317. The reversal of 1221331320300 is 30231331221.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22341406 + ... + 22396005.

Almost surely, 2^{1221331320300} is an apocalyptic number.

1221331320300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221331320300 is an abundant number, since it is smaller than the sum of its proper divisors (3127860924692).

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

1221331320300 is a wasteful number, since it uses less digits than its factorization.

1221331320300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44737448 (or 44737441 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 1221331320300 its reverse (30231331221), we get a palindrome (1251562651521).

The spelling of 1221331320300 in words is "one trillion, two hundred twenty-one billion, three hundred thirty-one million, three hundred twenty thousand, three hundred".