21323101101221 has 16 divisors (see below), whose sum is σ = 22475700633600. Its totient is φ = 20189592049968.

The previous prime is 21323101101187. The next prime is 21323101101229. The reversal of 21323101101221 is 12210110132312.

It is a cyclic number.

It is not a de Polignac number, because 21323101101221 - 2¹⁸ = 21323100839077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323101101193 and 21323101101202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323101101229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239561 + ... + 6534798.

It is an arithmetic number, because the mean of its divisors is an integer number (1404731289600).

Almost surely, 2^{21323101101221} is an apocalyptic number.

It is an amenable number.

21323101101221 is a deficient number, since it is larger than the sum of its proper divisors (1152599532379).

21323101101221 is a wasteful number, since it uses less digits than its factorization.

21323101101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6775768.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21323101101221 its reverse (12210110132312), we get a palindrome (33533211233533).

The spelling of 21323101101221 in words is "twenty-one trillion, three hundred twenty-three billion, one hundred one million, one hundred one thousand, two hundred twenty-one".