21200312223 has 16 divisors (see below), whose sum is σ = 32000473440. Its totient is φ = 13866869952.

The previous prime is 21200312183. The next prime is 21200312227. The reversal of 21200312223 is 32221300212.

It is not a de Polignac number, because 21200312223 - 2¹² = 21200308127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21200312196 and 21200312205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200312227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7406086 + ... + 7408947.

It is an arithmetic number, because the mean of its divisors is an integer number (2000029590).

Almost surely, 2^21200312223 is an apocalyptic number.

21200312223 is a deficient number, since it is larger than the sum of its proper divisors (10800161217).

21200312223 is a wasteful number, since it uses less digits than its factorization.

21200312223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14815095 (or 14815089 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21200312223 its reverse (32221300212), we get a palindrome (53421612435).

The spelling of 21200312223 in words is "twenty-one billion, two hundred million, three hundred twelve thousand, two hundred twenty-three".