21200031223 has 16 divisors (see below), whose sum is σ = 25555818240. Its totient is φ = 17179948800.

The previous prime is 21200031221. The next prime is 21200031227. The reversal of 21200031223 is 32213000212.

It is not a de Polignac number, because 21200031223 - 2¹ = 21200031221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200031197 and 21200031206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200031221) 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, 97018 + ... + 227623.

It is an arithmetic number, because the mean of its divisors is an integer number (1597238640).

Almost surely, 2^21200031223 is an apocalyptic number.

21200031223 is a deficient number, since it is larger than the sum of its proper divisors (4355787017).

21200031223 is a wasteful number, since it uses less digits than its factorization.

21200031223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325158.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21200031223 its reverse (32213000212), we get a palindrome (53413031435).

The spelling of 21200031223 in words is "twenty-one billion, two hundred million, thirty-one thousand, two hundred twenty-three".