221311301220 has 96 divisors (see below), whose sum is σ = 712266307200. Its totient is φ = 56981296512.

The previous prime is 221311301219. The next prime is 221311301243. The reversal of 221311301220 is 22103113122.

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 = 221311301193 and 221311301202.

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, 7050474 + ... + 7081793.

It is an arithmetic number, because the mean of its divisors is an integer number (7419440700).

Almost surely, 2^221311301220 is an apocalyptic number.

221311301220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221311301220 is an abundant number, since it is smaller than the sum of its proper divisors (490955005980).

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

221311301220 is a wasteful number, since it uses less digits than its factorization.

221311301220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14132314 (or 14132306 counting only the distinct ones).

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

Adding to 221311301220 its reverse (22103113122), we get a palindrome (243414414342).

The spelling of 221311301220 in words is "two hundred twenty-one billion, three hundred eleven million, three hundred one thousand, two hundred twenty".