20203123021 has 8 divisors (see below), whose sum is σ = 20406149784. Its totient is φ = 20000155200.

The previous prime is 20203122991. The next prime is 20203123027. The reversal of 20203123021 is 12032130202.

It can be written as a sum of positive squares in 4 ways, for example, as 99002500 + 20104120521 = 9950^2 + 141789^2 .

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 20203123021 - 2⁷ = 20203122893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20203122986 and 20203123004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20203123027) 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, 1074715 + ... + 1093351.

It is an arithmetic number, because the mean of its divisors is an integer number (2550768723).

Almost surely, 2^20203123021 is an apocalyptic number.

It is an amenable number.

20203123021 is a deficient number, since it is larger than the sum of its proper divisors (203026763).

20203123021 is a wasteful number, since it uses less digits than its factorization.

20203123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29471.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20203123021 its reverse (12032130202), we get a palindrome (32235253223).

The spelling of 20203123021 in words is "twenty billion, two hundred three million, one hundred twenty-three thousand, twenty-one".