21231303000221 has 4 divisors (see below), whose sum is σ = 21253722539712. Its totient is φ = 21208883460732.

The previous prime is 21231303000199. The next prime is 21231303000251. The reversal of 21231303000221 is 12200030313212.

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 21231303000221 - 2²⁶ = 21231235891357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231303000193 and 21231303000202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231303000251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11209768325 + ... + 11209770218.

It is an arithmetic number, because the mean of its divisors is an integer number (5313430634928).

Almost surely, 2^{21231303000221} is an apocalyptic number.

It is an amenable number.

21231303000221 is a deficient number, since it is larger than the sum of its proper divisors (22419539491).

21231303000221 is an equidigital number, since it uses as much as digits as its factorization.

21231303000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22419539490.

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

Adding to 21231303000221 its reverse (12200030313212), we get a palindrome (33431333313433).

The spelling of 21231303000221 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred three million, two hundred twenty-one", and thus it is an aban number.