220021201100221 has 4 divisors (see below), whose sum is σ = 220021231582492. Its totient is φ = 220021170617952.

The previous prime is 220021201100147. The next prime is 220021201100231. The reversal of 220021201100221 is 122001102120022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 27662192984196 + 192359008116025 = 5259486^2 + 13869355^2 .

It is a cyclic number.

It is not a de Polignac number, because 220021201100221 - 2³⁵ = 219986841361853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220021201100195 and 220021201100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021201100231) 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, 2366071 + ... + 21110203.

It is an arithmetic number, because the mean of its divisors is an integer number (55005307895623).

Almost surely, 2^{220021201100221} is an apocalyptic number.

It is an amenable number.

220021201100221 is a deficient number, since it is larger than the sum of its proper divisors (30482271).

220021201100221 is a wasteful number, since it uses less digits than its factorization.

220021201100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30482270.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 220021201100221 its reverse (122001102120022), we get a palindrome (342022303220243).

The spelling of 220021201100221 in words is "two hundred twenty trillion, twenty-one billion, two hundred one million, one hundred thousand, two hundred twenty-one".