21012113113223 has 4 divisors (see below), whose sum is σ = 22248119766960. Its totient is φ = 19776106459488.

The previous prime is 21012113113213. The next prime is 21012113113357. The reversal of 21012113113223 is 32231131121012.

It is a happy number.

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 21012113113223 - 2¹⁶ = 21012113047687 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 (21012113113213) 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, 618003326843 + ... + 618003326876.

It is an arithmetic number, because the mean of its divisors is an integer number (5562029941740).

Almost surely, 2^{21012113113223} is an apocalyptic number.

21012113113223 is a deficient number, since it is larger than the sum of its proper divisors (1236006653737).

21012113113223 is a wasteful number, since it uses less digits than its factorization.

21012113113223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236006653736.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21012113113223 its reverse (32231131121012), we get a palindrome (53243244234235).

The spelling of 21012113113223 in words is "twenty-one trillion, twelve billion, one hundred thirteen million, one hundred thirteen thousand, two hundred twenty-three".