20201122112021 has 4 divisors (see below), whose sum is σ = 20317891604172. Its totient is φ = 20084352619872.

The previous prime is 20201122112009. The next prime is 20201122112051. The reversal of 20201122112021 is 12021122110202.

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 13462368192100 + 6738753919921 = 3669110^2 + 2595911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201122112021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201122112051) 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, 58384745816 + ... + 58384746161.

It is an arithmetic number, because the mean of its divisors is an integer number (5079472901043).

Almost surely, 2^{20201122112021} is an apocalyptic number.

It is an amenable number.

20201122112021 is a deficient number, since it is larger than the sum of its proper divisors (116769492151).

20201122112021 is a wasteful number, since it uses less digits than its factorization.

20201122112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116769492150.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20201122112021 its reverse (12021122110202), we get a palindrome (32222244222223).

The spelling of 20201122112021 in words is "twenty trillion, two hundred one billion, one hundred twenty-two million, one hundred twelve thousand, twenty-one".