201131221320 has 48 divisors (see below), whose sum is σ = 653676470460. Its totient is φ = 53634992256.

The previous prime is 201131221273. The next prime is 201131221327. The reversal of 201131221320 is 23122131102.

201131221320 is a `hidden beast` number, since 2 + 0 + 11 + 312 + 21 + 320 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 198240438564 + 2890782756 = 445242^2 + 53766^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 201131221293 and 201131221302.

It is not an unprimeable number, because it can be changed into a prime (201131221327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 279348559 + ... + 279349278.

Almost surely, 2^201131221320 is an apocalyptic number.

201131221320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201131221320 is an abundant number, since it is smaller than the sum of its proper divisors (452545249140).

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

201131221320 is a wasteful number, since it uses less digits than its factorization.

201131221320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558697854 (or 558697847 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 201131221320 its reverse (23122131102), we get a palindrome (224253352422).

The spelling of 201131221320 in words is "two hundred one billion, one hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty".