21223131113 has 4 divisors (see below), whose sum is σ = 22145875968. Its totient is φ = 20300386260.

The previous prime is 21223131089. The next prime is 21223131187. The reversal of 21223131113 is 31113132212.

It is a happy number.

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 21223131113 - 2⁸ = 21223130857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21223131913) 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, 461372393 + ... + 461372438.

It is an arithmetic number, because the mean of its divisors is an integer number (5536468992).

Almost surely, 2^21223131113 is an apocalyptic number.

21223131113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21223131113 is a deficient number, since it is larger than the sum of its proper divisors (922744855).

21223131113 is an equidigital number, since it uses as much as digits as its factorization.

21223131113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922744854.

The product of its digits is 216, while the sum is 20.

Adding to 21223131113 its reverse (31113132212), we get a palindrome (52336263325).

The spelling of 21223131113 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirty-one thousand, one hundred thirteen".