21231200111321 has 4 divisors (see below), whose sum is σ = 21682927773312. Its totient is φ = 20779472449332.

The previous prime is 21231200111279. The next prime is 21231200111339. The reversal of 21231200111321 is 12311100213212.

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 21231200111321 - 2¹⁰ = 21231200110297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21231200111293 and 21231200111302.

It is not an unprimeable number, because it can be changed into a prime (21231200111021) 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, 225863830925 + ... + 225863831018.

It is an arithmetic number, because the mean of its divisors is an integer number (5420731943328).

Almost surely, 2^{21231200111321} is an apocalyptic number.

It is an amenable number.

21231200111321 is a deficient number, since it is larger than the sum of its proper divisors (451727661991).

21231200111321 is an equidigital number, since it uses as much as digits as its factorization.

21231200111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451727661990.

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

Adding to 21231200111321 its reverse (12311100213212), we get a palindrome (33542300324533).

The spelling of 21231200111321 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred million, one hundred eleven thousand, three hundred twenty-one".