221223134220 has 144 divisors (see below), whose sum is σ = 706394449152. Its totient is φ = 51298037120.

The previous prime is 221223134087. The next prime is 221223134233. The reversal of 221223134220 is 22431322122.

It is a super-2 number, since 2×221223134220² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32329 + ... + 665951.

It is an arithmetic number, because the mean of its divisors is an integer number (4905517008).

Almost surely, 2^221223134220 is an apocalyptic number.

221223134220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221223134220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353197224576).

221223134220 is an abundant number, since it is smaller than the sum of its proper divisors (485171314932).

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

221223134220 is a wasteful number, since it uses less digits than its factorization.

221223134220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633692 (or 633667 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 221223134220 its reverse (22431322122), we get a palindrome (243654456342).

The spelling of 221223134220 in words is "two hundred twenty-one billion, two hundred twenty-three million, one hundred thirty-four thousand, two hundred twenty".