220110102021221 has 4 divisors (see below), whose sum is σ = 220110158219532. Its totient is φ = 220110045822912.

The previous prime is 220110102021143. The next prime is 220110102021263. The reversal of 220110102021221 is 122120201011022.

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 207817855660321 + 12292246360900 = 14415889^2 + 3506030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220110102021221 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 220110102021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220110102021281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21745226 + ... + 30217131.

It is an arithmetic number, because the mean of its divisors is an integer number (55027539554883).

Almost surely, 2^{220110102021221} is an apocalyptic number.

It is an amenable number.

220110102021221 is a deficient number, since it is larger than the sum of its proper divisors (56198311).

220110102021221 is an equidigital number, since it uses as much as digits as its factorization.

220110102021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56198310.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 220110102021221 its reverse (122120201011022), we get a palindrome (342230303032243).

The spelling of 220110102021221 in words is "two hundred twenty trillion, one hundred ten billion, one hundred two million, twenty-one thousand, two hundred twenty-one".