221221121220010 has 16 divisors (see below), whose sum is σ = 398198508148872. Its totient is φ = 88488339609600.

The previous prime is 221221121219999. The next prime is 221221121220097. The reversal of 221221121220010 is 10022121122122.

221221121220010 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 159940108508049 + 61281012711961 = 12646743^2 + 7828219^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221221121220010.

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, 4804911 + ... + 21576130.

Almost surely, 2^{221221121220010} is an apocalyptic number.

221221121220010 is a deficient number, since it is larger than the sum of its proper divisors (176977386928862).

221221121220010 is a wasteful number, since it uses less digits than its factorization.

221221121220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27219609.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221221121220010 its reverse (10022121122122), we get a palindrome (231243242342132).

The spelling of 221221121220010 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twenty thousand, ten".