221011331220 has 96 divisors (see below), whose sum is σ = 694017072000. Its totient is φ = 58385532672.

The previous prime is 221011331179. The next prime is 221011331263. The reversal of 221011331220 is 22133110122.

221011331220 is a `hidden beast` number, since 221 + 0 + 113 + 312 + 20 = 666.

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 = 221011331193 and 221011331202.

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, 1854745 + ... + 1970304.

It is an arithmetic number, because the mean of its divisors is an integer number (7229344500).

Almost surely, 2^221011331220 is an apocalyptic number.

221011331220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221011331220 is an abundant number, since it is smaller than the sum of its proper divisors (473005740780).

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

221011331220 is a wasteful number, since it uses less digits than its factorization.

221011331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825174 (or 3825166 counting only the distinct ones).

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

Adding to 221011331220 its reverse (22133110122), we get a palindrome (243144441342).

The spelling of 221011331220 in words is "two hundred twenty-one billion, eleven million, three hundred thirty-one thousand, two hundred twenty".