221440210304221 has 4 divisors (see below), whose sum is σ = 221992430280444. Its totient is φ = 220887990328000.

The previous prime is 221440210304219. The next prime is 221440210304239. The reversal of 221440210304221 is 122403012044122.

221440210304221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 132661697908996 + 88778512395225 = 11517886^2 + 9422235^2 .

It is a cyclic number.

It is not a de Polignac number, because 221440210304221 - 2¹ = 221440210304219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221440210304221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221440210304021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276109987510 + ... + 276109988311.

It is an arithmetic number, because the mean of its divisors is an integer number (55498107570111).

Almost surely, 2^{221440210304221} is an apocalyptic number.

It is an amenable number.

221440210304221 is a deficient number, since it is larger than the sum of its proper divisors (552219976223).

221440210304221 is an equidigital number, since it uses as much as digits as its factorization.

221440210304221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552219976222.

The product of its (nonzero) digits is 6144, while the sum is 28.

Adding to 221440210304221 its reverse (122403012044122), we get a palindrome (343843222348343).

The spelling of 221440210304221 in words is "two hundred twenty-one trillion, four hundred forty billion, two hundred ten million, three hundred four thousand, two hundred twenty-one".