21000122313223 has 4 divisors (see below), whose sum is σ = 21396351036168. Its totient is φ = 20603893590280.

The previous prime is 21000122313193. The next prime is 21000122313263. The reversal of 21000122313223 is 32231322100012.

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 21000122313223 - 2³⁷ = 20862683359751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000122313194 and 21000122313203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000122313263) 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, 198114361393 + ... + 198114361498.

It is an arithmetic number, because the mean of its divisors is an integer number (5349087759042).

Almost surely, 2^{21000122313223} is an apocalyptic number.

21000122313223 is a deficient number, since it is larger than the sum of its proper divisors (396228722945).

21000122313223 is an equidigital number, since it uses as much as digits as its factorization.

21000122313223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396228722944.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21000122313223 its reverse (32231322100012), we get a palindrome (53231444413235).

The spelling of 21000122313223 in words is "twenty-one trillion, one hundred twenty-two million, three hundred thirteen thousand, two hundred twenty-three".