220100210221 has 4 divisors (see below), whose sum is σ = 221240626012. Its totient is φ = 218959794432.

The previous prime is 220100210171. The next prime is 220100210243. The reversal of 220100210221 is 122012001022.

It is a happy number.

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 101203515625 + 118896694596 = 318125^2 + 344814^2 .

It is a cyclic number.

It is not a de Polignac number, because 220100210221 - 2²³ = 220091821613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220100210921) 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, 570207606 + ... + 570207991.

It is an arithmetic number, because the mean of its divisors is an integer number (55310156503).

Almost surely, 2^220100210221 is an apocalyptic number.

It is an amenable number.

220100210221 is a deficient number, since it is larger than the sum of its proper divisors (1140415791).

220100210221 is a wasteful number, since it uses less digits than its factorization.

220100210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140415790.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 220100210221 its reverse (122012001022), we get a palindrome (342112211243).

The spelling of 220100210221 in words is "two hundred twenty billion, one hundred million, two hundred ten thousand, two hundred twenty-one".