20201121331 has 4 divisors (see below), whose sum is σ = 20201408152. Its totient is φ = 20200834512.

The previous prime is 20201121307. The next prime is 20201121341. The reversal of 20201121331 is 13312110202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20201121331 - 2¹¹ = 20201119283 is a prime.

It is a super-2 number, since 2×20201121331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201121341) 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, 43036 + ... + 205558.

It is an arithmetic number, because the mean of its divisors is an integer number (5050352038).

Almost surely, 2^20201121331 is an apocalyptic number.

20201121331 is a deficient number, since it is larger than the sum of its proper divisors (286821).

20201121331 is a wasteful number, since it uses less digits than its factorization.

20201121331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286820.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20201121331 its reverse (13312110202), we get a palindrome (33513231533).

The spelling of 20201121331 in words is "twenty billion, two hundred one million, one hundred twenty-one thousand, three hundred thirty-one".