20031023221 has 4 divisors (see below), whose sum is σ = 21852025344. Its totient is φ = 18210021100.

The previous prime is 20031023213. The next prime is 20031023251. The reversal of 20031023221 is 12232013002.

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 20031023221 - 2³ = 20031023213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20031023195 and 20031023204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031023251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 910501045 + ... + 910501066.

It is an arithmetic number, because the mean of its divisors is an integer number (5463006336).

Almost surely, 2^20031023221 is an apocalyptic number.

It is an amenable number.

20031023221 is a deficient number, since it is larger than the sum of its proper divisors (1821002123).

20031023221 is a wasteful number, since it uses less digits than its factorization.

20031023221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821002122.

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

Adding to 20031023221 its reverse (12232013002), we get a palindrome (32263036223).

The spelling of 20031023221 in words is "twenty billion, thirty-one million, twenty-three thousand, two hundred twenty-one".