221220042402344 has 32 divisors (see below), whose sum is σ = 418595882027400. Its totient is φ = 109594487980800.

The previous prime is 221220042402283. The next prime is 221220042402347. The reversal of 221220042402344 is 443204240022122.

It can be written as a sum of positive squares in 4 ways, for example, as 212732084574244 + 8487957828100 = 14585338^2 + 2913410^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221220042402344.

It is not an unprimeable number, because it can be changed into a prime (221220042402347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136865294 + ... + 138472194.

Almost surely, 2^{221220042402344} is an apocalyptic number.

It is an amenable number.

221220042402344 is a deficient number, since it is larger than the sum of its proper divisors (197375839625056).

221220042402344 is a wasteful number, since it uses less digits than its factorization.

221220042402344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764893 (or 1764889 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 32.

Adding to 221220042402344 its reverse (443204240022122), we get a palindrome (664424282424466).

The spelling of 221220042402344 in words is "two hundred twenty-one trillion, two hundred twenty billion, forty-two million, four hundred two thousand, three hundred forty-four".