21321231120311 has 4 divisors (see below), whose sum is σ = 21344635326624. Its totient is φ = 21297826914000.

The previous prime is 21321231120289. The next prime is 21321231120323. The reversal of 21321231120311 is 11302113212312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21321231120311 - 2⁶ = 21321231120247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321231129311) 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, 11702101790 + ... + 11702103611.

It is an arithmetic number, because the mean of its divisors is an integer number (5336158831656).

Almost surely, 2^{21321231120311} is an apocalyptic number.

21321231120311 is a deficient number, since it is larger than the sum of its proper divisors (23404206313).

21321231120311 is an equidigital number, since it uses as much as digits as its factorization.

21321231120311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23404206312.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21321231120311 its reverse (11302113212312), we get a palindrome (32623344332623).

The spelling of 21321231120311 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred thirty-one million, one hundred twenty thousand, three hundred eleven".