20201102221 has 4 divisors (see below), whose sum is σ = 20317871772. Its totient is φ = 20084332672.

The previous prime is 20201102209. The next prime is 20201102249. The reversal of 20201102221 is 12220110202.

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 19269326596 + 931775625 = 138814^2 + 30525^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201102221 - 2²⁵ = 20167547789 is a prime.

It is a super-2 number, since 2×20201102221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201102281) 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, 58384516 + ... + 58384861.

It is an arithmetic number, because the mean of its divisors is an integer number (5079467943).

Almost surely, 2^20201102221 is an apocalyptic number.

It is an amenable number.

20201102221 is a deficient number, since it is larger than the sum of its proper divisors (116769551).

20201102221 is a wasteful number, since it uses less digits than its factorization.

20201102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116769550.

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

Adding to 20201102221 its reverse (12220110202), we get a palindrome (32421212423).

The spelling of 20201102221 in words is "twenty billion, two hundred one million, one hundred two thousand, two hundred twenty-one".