21311233011213 has 4 divisors (see below), whose sum is σ = 28414977348288. Its totient is φ = 14207488674140.

The previous prime is 21311233011209. The next prime is 21311233011223. The reversal of 21311233011213 is 31211033211312.

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 21311233011213 - 2² = 21311233011209 is a prime.

It is a super-2 number, since 2×21311233011213² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311233011223) 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, 3551872168533 + ... + 3551872168538.

It is an arithmetic number, because the mean of its divisors is an integer number (7103744337072).

Almost surely, 2^{21311233011213} is an apocalyptic number.

It is an amenable number.

21311233011213 is a deficient number, since it is larger than the sum of its proper divisors (7103744337075).

21311233011213 is an equidigital number, since it uses as much as digits as its factorization.

21311233011213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7103744337074.

The product of its (nonzero) digits is 648, while the sum is 24.

Adding to 21311233011213 its reverse (31211033211312), we get a palindrome (52522266222525).

The spelling of 21311233011213 in words is "twenty-one trillion, three hundred eleven billion, two hundred thirty-three million, eleven thousand, two hundred thirteen".