20231121021 has 4 divisors (see below), whose sum is σ = 26974828032. Its totient is φ = 13487414012.

The previous prime is 20231120989. The next prime is 20231121047. The reversal of 20231121021 is 12012113202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20231121021 - 2⁵ = 20231120989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20231121061) 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, 3371853501 + ... + 3371853506.

It is an arithmetic number, because the mean of its divisors is an integer number (6743707008).

Almost surely, 2^20231121021 is an apocalyptic number.

It is an amenable number.

20231121021 is a deficient number, since it is larger than the sum of its proper divisors (6743707011).

20231121021 is an equidigital number, since it uses as much as digits as its factorization.

20231121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6743707010.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20231121021 its reverse (12012113202), we get a palindrome (32243234223).

The spelling of 20231121021 in words is "twenty billion, two hundred thirty-one million, one hundred twenty-one thousand, twenty-one".