221131331320 has 64 divisors (see below), whose sum is σ = 499935875040. Its totient is φ = 88028160000.

The previous prime is 221131331263. The next prime is 221131331339. The reversal of 221131331320 is 23133131122.

It is a super-2 number, since 2×221131331320² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221131331291 and 221131331300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13254504 + ... + 13271176.

Almost surely, 2^221131331320 is an apocalyptic number.

221131331320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221131331320 is an abundant number, since it is smaller than the sum of its proper divisors (278804543720).

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

221131331320 is a wasteful number, since it uses less digits than its factorization.

221131331320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18256 (or 18252 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 221131331320 its reverse (23133131122), we get a palindrome (244264462442).

The spelling of 221131331320 in words is "two hundred twenty-one billion, one hundred thirty-one million, three hundred thirty-one thousand, three hundred twenty".