20201020002221 has 4 divisors (see below), whose sum is σ = 20214660125244. Its totient is φ = 20187379879200.

The previous prime is 20201020002193. The next prime is 20201020002223. The reversal of 20201020002221 is 12220002010202.

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 15872144448196 + 4328875554025 = 3983986^2 + 2080595^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201020002221 - 2²⁶ = 20200952893357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201020002196 and 20201020002205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201020002223) 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, 6820059290 + ... + 6820062251.

It is an arithmetic number, because the mean of its divisors is an integer number (5053665031311).

Almost surely, 2^{20201020002221} is an apocalyptic number.

It is an amenable number.

20201020002221 is a deficient number, since it is larger than the sum of its proper divisors (13640123023).

20201020002221 is a wasteful number, since it uses less digits than its factorization.

20201020002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13640123022.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20201020002221 its reverse (12220002010202), we get a palindrome (32421022012423).

The spelling of 20201020002221 in words is "twenty trillion, two hundred one billion, twenty million, two thousand, two hundred twenty-one".