20331121021 has 8 divisors (see below), whose sum is σ = 21155468544. Its totient is φ = 19523097360.

The previous prime is 20331121001. The next prime is 20331121043. The reversal of 20331121021 is 12012113302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20331121021 - 2⁷ = 20331120893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20331120986 and 20331121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331121001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4078425 + ... + 4083406.

It is an arithmetic number, because the mean of its divisors is an integer number (2644433568).

Almost surely, 2^20331121021 is an apocalyptic number.

It is an amenable number.

20331121021 is a deficient number, since it is larger than the sum of its proper divisors (824347523).

20331121021 is an equidigital number, since it uses as much as digits as its factorization.

20331121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8161931.

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

Adding to 20331121021 its reverse (12012113302), we get a palindrome (32343234323).

The spelling of 20331121021 in words is "twenty billion, three hundred thirty-one million, one hundred twenty-one thousand, twenty-one".