1321201311220 has 24 divisors (see below), whose sum is σ = 3170883147264. Its totient is φ = 452983306656.

The previous prime is 1321201311203. The next prime is 1321201311251. The reversal of 1321201311220 is 221131021231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4718575972 + ... + 4718576251.

It is an arithmetic number, because the mean of its divisors is an integer number (132120131136).

Almost surely, 2^{1321201311220} is an apocalyptic number.

1321201311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321201311220 is an abundant number, since it is smaller than the sum of its proper divisors (1849681836044).

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

1321201311220 is a wasteful number, since it uses less digits than its factorization.

1321201311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9437152239 (or 9437152237 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1321201311220 its reverse (221131021231), we get a palindrome (1542332332451).

The spelling of 1321201311220 in words is "one trillion, three hundred twenty-one billion, two hundred one million, three hundred eleven thousand, two hundred twenty".