21300312223 has 4 divisors (see below), whose sum is σ = 21417993688. Its totient is φ = 21182630760.

The previous prime is 21300312221. The next prime is 21300312233. The reversal of 21300312223 is 32221300312.

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 21300312223 - 2¹ = 21300312221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21300312223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300312221) 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, 58840461 + ... + 58840822.

It is an arithmetic number, because the mean of its divisors is an integer number (5354498422).

Almost surely, 2^21300312223 is an apocalyptic number.

21300312223 is a deficient number, since it is larger than the sum of its proper divisors (117681465).

21300312223 is a wasteful number, since it uses less digits than its factorization.

21300312223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117681464.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21300312223 its reverse (32221300312), we get a palindrome (53521612535).

The spelling of 21300312223 in words is "twenty-one billion, three hundred million, three hundred twelve thousand, two hundred twenty-three".