20023441021 has 4 divisors (see below), whose sum is σ = 20135304000. Its totient is φ = 19911578044.

The previous prime is 20023441001. The next prime is 20023441069. The reversal of 20023441021 is 12014432002.

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 20023441021 - 2⁷ = 20023440893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20023441021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023441001) 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, 55931221 + ... + 55931578.

It is an arithmetic number, because the mean of its divisors is an integer number (5033826000).

Almost surely, 2^20023441021 is an apocalyptic number.

It is an amenable number.

20023441021 is a deficient number, since it is larger than the sum of its proper divisors (111862979).

20023441021 is a wasteful number, since it uses less digits than its factorization.

20023441021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111862978.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 20023441021 its reverse (12014432002), we get a palindrome (32037873023).

The spelling of 20023441021 in words is "twenty billion, twenty-three million, four hundred forty-one thousand, twenty-one".