21231101303221 has 4 divisors (see below), whose sum is σ = 21682826862912. Its totient is φ = 20779375743532.

The previous prime is 21231101303171. The next prime is 21231101303323. The reversal of 21231101303221 is 12230310113212.

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 21231101303221 - 2¹⁹ = 21231100778933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231101303192 and 21231101303201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231101603221) 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, 225862779775 + ... + 225862779868.

It is an arithmetic number, because the mean of its divisors is an integer number (5420706715728).

Almost surely, 2^{21231101303221} is an apocalyptic number.

It is an amenable number.

21231101303221 is a deficient number, since it is larger than the sum of its proper divisors (451725559691).

21231101303221 is an equidigital number, since it uses as much as digits as its factorization.

21231101303221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451725559690.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21231101303221 its reverse (12230310113212), we get a palindrome (33461411416433).

The spelling of 21231101303221 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred one million, three hundred three thousand, two hundred twenty-one".