20201002202221 has 4 divisors (see below), whose sum is σ = 20203757016892. Its totient is φ = 20198247387552.

The previous prime is 20201002202201. The next prime is 20201002202243. The reversal of 20201002202221 is 12220220010202.

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 681262048996 + 19519740153225 = 825386^2 + 4418115^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201002202221 - 2⁵ = 20201002202189 is a prime.

It is a super-3 number, since 3×20201002202221³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201002202195 and 20201002202204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201002202201) 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, 1377396336 + ... + 1377411001.

It is an arithmetic number, because the mean of its divisors is an integer number (5050939254223).

Almost surely, 2^{20201002202221} is an apocalyptic number.

It is an amenable number.

20201002202221 is a deficient number, since it is larger than the sum of its proper divisors (2754814671).

20201002202221 is an equidigital number, since it uses as much as digits as its factorization.

20201002202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754814670.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 20201002202221 its reverse (12220220010202), we get a palindrome (32421222212423).

The spelling of 20201002202221 in words is "twenty trillion, two hundred one billion, two million, two hundred two thousand, two hundred twenty-one".