221311423220 has 24 divisors (see below), whose sum is σ = 464763932808. Its totient is φ = 88522675200.

The previous prime is 221311423213. The next prime is 221311423237. The reversal of 221311423220 is 22324113122.

It can be written as a sum of positive squares in 4 ways, for example, as 1577360656 + 219734062564 = 39716^2 + 468758^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1195280 + ... + 1367960.

It is an arithmetic number, because the mean of its divisors is an integer number (19365163867).

Almost surely, 2^221311423220 is an apocalyptic number.

221311423220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221311423220 is an abundant number, since it is smaller than the sum of its proper divisors (243452509588).

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

221311423220 is a wasteful number, since it uses less digits than its factorization.

221311423220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236771 (or 236769 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 221311423220 its reverse (22324113122), we get a palindrome (243635536342).

The spelling of 221311423220 in words is "two hundred twenty-one billion, three hundred eleven million, four hundred twenty-three thousand, two hundred twenty".