221012110110221 has 4 divisors (see below), whose sum is σ = 226402649381244. Its totient is φ = 215621570839200.

The previous prime is 221012110110193. The next prime is 221012110110251. The reversal of 221012110110221 is 122011011210122.

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 124368464547721 + 96643645562500 = 11152061^2 + 9830750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221012110110221 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 221012110110221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012110110251) 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, 2695269635450 + ... + 2695269635531.

It is an arithmetic number, because the mean of its divisors is an integer number (56600662345311).

Almost surely, 2^{221012110110221} is an apocalyptic number.

It is an amenable number.

221012110110221 is a deficient number, since it is larger than the sum of its proper divisors (5390539271023).

221012110110221 is an equidigital number, since it uses as much as digits as its factorization.

221012110110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5390539271022.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221012110110221 its reverse (122011011210122), we get a palindrome (343023121320343).

The spelling of 221012110110221 in words is "two hundred twenty-one trillion, twelve billion, one hundred ten million, one hundred ten thousand, two hundred twenty-one".