21013312212223 has 4 divisors (see below), whose sum is σ = 21014142507880. Its totient is φ = 21012481916568.

The previous prime is 21013312212197. The next prime is 21013312212247. The reversal of 21013312212223 is 32221221331012.

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 21013312212223 - 2²¹ = 21013310115071 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 (21013312212253) 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, 415109865 + ... + 415160482.

It is an arithmetic number, because the mean of its divisors is an integer number (5253535626970).

Almost surely, 2^{21013312212223} is an apocalyptic number.

21013312212223 is a deficient number, since it is larger than the sum of its proper divisors (830295657).

21013312212223 is an equidigital number, since it uses as much as digits as its factorization.

21013312212223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830295656.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21013312212223 its reverse (32221221331012), we get a palindrome (53234533543235).

The spelling of 21013312212223 in words is "twenty-one trillion, thirteen billion, three hundred twelve million, two hundred twelve thousand, two hundred twenty-three".