221334243444 has 144 divisors (see below), whose sum is σ = 584463175296. Its totient is φ = 73238256000.

The previous prime is 221334243437. The next prime is 221334243463. The reversal of 221334243444 is 444342433122.

221334243444 is a `hidden beast` number, since 2 + 2 + 133 + 42 + 43 + 444 = 666.

It is a super-2 number, since 2×221334243444² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 221334243399 and 221334243408.

It is a congruent number.

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, 170125594 + ... + 170126894.

Almost surely, 2^221334243444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221334243444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292231587648).

221334243444 is an abundant number, since it is smaller than the sum of its proper divisors (363128931852).

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

221334243444 is a wasteful number, since it uses less digits than its factorization.

221334243444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468 (or 2454 counting only the distinct ones).

The product of its digits is 221184, while the sum is 36.

Adding to 221334243444 its reverse (444342433122), we get a palindrome (665676676566).

The spelling of 221334243444 in words is "two hundred twenty-one billion, three hundred thirty-four million, two hundred forty-three thousand, four hundred forty-four".