20201121101221 has 2 divisors, whose sum is σ = 20201121101222. Its totient is φ = 20201121101220.

The previous prime is 20201121101219. The next prime is 20201121101257. The reversal of 20201121101221 is 12210112110202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12182794428996 + 8018326672225 = 3490386^2 + 2831665^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201121101221 - 2¹ = 20201121101219 is a prime.

Together with 20201121101219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20201121101195 and 20201121101204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201121501221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100560550610 + 10100560550611.

It is an arithmetic number, because the mean of its divisors is an integer number (10100560550611).

Almost surely, 2^{20201121101221} is an apocalyptic number.

It is an amenable number.

20201121101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201121101221 is an equidigital number, since it uses as much as digits as its factorization.

20201121101221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20201121101221 its reverse (12210112110202), we get a palindrome (32411233211423).

The spelling of 20201121101221 in words is "twenty trillion, two hundred one billion, one hundred twenty-one million, one hundred one thousand, two hundred twenty-one".