21023233111213 has 4 divisors (see below), whose sum is σ = 21937286724768. Its totient is φ = 20109179497660.

The previous prime is 21023233111189. The next prime is 21023233111217. The reversal of 21023233111213 is 31211133232012.

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 21023233111213 - 2³³ = 21014643176621 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 (21023233111217) 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, 457026806743 + ... + 457026806788.

It is an arithmetic number, because the mean of its divisors is an integer number (5484321681192).

Almost surely, 2^{21023233111213} is an apocalyptic number.

21023233111213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21023233111213 is a deficient number, since it is larger than the sum of its proper divisors (914053613555).

21023233111213 is an equidigital number, since it uses as much as digits as its factorization.

21023233111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914053613554.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21023233111213 its reverse (31211133232012), we get a palindrome (52234366343225).

The spelling of 21023233111213 in words is "twenty-one trillion, twenty-three billion, two hundred thirty-three million, one hundred eleven thousand, two hundred thirteen".