221131010320 has 80 divisors (see below), whose sum is σ = 567626294592. Its totient is φ = 79442439680.

The previous prime is 221131010231. The next prime is 221131010323. The reversal of 221131010320 is 23010131122.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 221131010294 and 221131010303.

It is not an unprimeable number, because it can be changed into a prime (221131010323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1440727 + ... + 1586806.

Almost surely, 2^221131010320 is an apocalyptic number.

221131010320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221131010320 is an abundant number, since it is smaller than the sum of its proper divisors (346495284272).

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

221131010320 is a wasteful number, since it uses less digits than its factorization.

221131010320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027640 (or 3027634 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 221131010320 its reverse (23010131122), we get a palindrome (244141141442).

The spelling of 221131010320 in words is "two hundred twenty-one billion, one hundred thirty-one million, ten thousand, three hundred twenty".