21231110320321 has 4 divisors (see below), whose sum is σ = 23161211258544. Its totient is φ = 19301009382100.

The previous prime is 21231110320319. The next prime is 21231110320333. The reversal of 21231110320321 is 12302301113212.

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 21231110320321 - 2¹ = 21231110320319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231110320292 and 21231110320301.

It is not an unprimeable number, because it can be changed into a prime (21231110323321) 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, 965050469095 + ... + 965050469116.

It is an arithmetic number, because the mean of its divisors is an integer number (5790302814636).

Almost surely, 2^{21231110320321} is an apocalyptic number.

It is an amenable number.

21231110320321 is a deficient number, since it is larger than the sum of its proper divisors (1930100938223).

21231110320321 is a wasteful number, since it uses less digits than its factorization.

21231110320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930100938222.

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

Adding to 21231110320321 its reverse (12302301113212), we get a palindrome (33533411433533).

The spelling of 21231110320321 in words is "twenty-one trillion, two hundred thirty-one billion, one hundred ten million, three hundred twenty thousand, three hundred twenty-one".