20031003123221 has 4 divisors (see below), whose sum is σ = 20031012250944. Its totient is φ = 20030993995500.

The previous prime is 20031003123169. The next prime is 20031003123227. The reversal of 20031003123221 is 12232130013002.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20031003123221 - 2¹⁴ = 20031003106837 is a prime.

It is a super-2 number, since 2×20031003123221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20031003123193 and 20031003123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031003123227) 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, 942116 + ... + 6399186.

It is an arithmetic number, because the mean of its divisors is an integer number (5007753062736).

Almost surely, 2^{20031003123221} is an apocalyptic number.

It is an amenable number.

20031003123221 is a deficient number, since it is larger than the sum of its proper divisors (9127723).

20031003123221 is an equidigital number, since it uses as much as digits as its factorization.

20031003123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9127722.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20031003123221 its reverse (12232130013002), we get a palindrome (32263133136223).

The spelling of 20031003123221 in words is "twenty trillion, thirty-one billion, three million, one hundred twenty-three thousand, two hundred twenty-one".