21223203231311 has 8 divisors (see below), whose sum is σ = 21540048798000. Its totient is φ = 20906360057088.

The previous prime is 21223203231289. The next prime is 21223203231359. The reversal of 21223203231311 is 11313230232212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223203231311 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 (21223203231611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26114975 + ... + 26915391.

It is an arithmetic number, because the mean of its divisors is an integer number (2692506099750).

Almost surely, 2^{21223203231311} is an apocalyptic number.

21223203231311 is a deficient number, since it is larger than the sum of its proper divisors (316845566689).

21223203231311 is an equidigital number, since it uses as much as digits as its factorization.

21223203231311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196233.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21223203231311 its reverse (11313230232212), we get a palindrome (32536433463523).

The spelling of 21223203231311 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred three million, two hundred thirty-one thousand, three hundred eleven".