21013312223 has 4 divisors (see below), whose sum is σ = 21013808448. Its totient is φ = 21012816000.

The previous prime is 21013312193. The next prime is 21013312231. The reversal of 21013312223 is 32221331012.

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 21013312223 - 2²² = 21009117919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21013312195 and 21013312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013312253) 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, 177986 + ... + 271487.

It is an arithmetic number, because the mean of its divisors is an integer number (5253452112).

Almost surely, 2^21013312223 is an apocalyptic number.

21013312223 is a deficient number, since it is larger than the sum of its proper divisors (496225).

21013312223 is an equidigital number, since it uses as much as digits as its factorization.

21013312223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496224.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21013312223 its reverse (32221331012), we get a palindrome (53234643235).

The spelling of 21013312223 in words is "twenty-one billion, thirteen million, three hundred twelve thousand, two hundred twenty-three".