201221131111320 has 128 divisors (see below), whose sum is σ = 611988115550400. Its totient is φ = 52919125991424.

The previous prime is 201221131111303. The next prime is 201221131111331. The reversal of 201221131111320 is 23111131122102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96316386 + ... + 98383374.

Almost surely, 2^{201221131111320} is an apocalyptic number.

201221131111320 is a gapful number since it is divisible by the number (20) 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 201221131111320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305994057775200).

201221131111320 is an abundant number, since it is smaller than the sum of its proper divisors (410766984439080).

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

201221131111320 is a wasteful number, since it uses less digits than its factorization.

201221131111320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078189 (or 2078185 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 201221131111320 its reverse (23111131122102), we get a palindrome (224332262233422).

The spelling of 201221131111320 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred thirty-one million, one hundred eleven thousand, three hundred twenty".