20022221100221 has 8 divisors (see below), whose sum is σ = 20712732856920. Its totient is φ = 19331715366208.

The previous prime is 20022221100197. The next prime is 20022221100227. The reversal of 20022221100221 is 12200112222002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14402640121 + 20007818460100 = 120011^2 + 4473010^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20022221100221 - 2³⁴ = 20005041231037 is a prime.

It is a super-2 number, since 2×20022221100221² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20022221100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022221100227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5870435 + ... + 8631711.

It is an arithmetic number, because the mean of its divisors is an integer number (2589091607115).

Almost surely, 2^{20022221100221} is an apocalyptic number.

It is an amenable number.

20022221100221 is a deficient number, since it is larger than the sum of its proper divisors (690511756699).

20022221100221 is a wasteful number, since it uses less digits than its factorization.

20022221100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011343.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20022221100221 its reverse (12200112222002), we get a palindrome (32222333322223).

The spelling of 20022221100221 in words is "twenty trillion, twenty-two billion, two hundred twenty-one million, one hundred thousand, two hundred twenty-one".