21031200223 has 16 divisors (see below), whose sum is σ = 23524693920. Its totient is φ = 18635507200.

The previous prime is 21031200221. The next prime is 21031200271. The reversal of 21031200223 is 32200213012.

It is a cyclic number.

It is not a de Polignac number, because 21031200223 - 2¹ = 21031200221 is a prime.

It is a super-2 number, since 2×21031200223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031200197 and 21031200206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031200221) 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, 473493 + ... + 516001.

It is an arithmetic number, because the mean of its divisors is an integer number (1470293370).

Almost surely, 2^21031200223 is an apocalyptic number.

21031200223 is a deficient number, since it is larger than the sum of its proper divisors (2493493697).

21031200223 is a wasteful number, since it uses less digits than its factorization.

21031200223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43658.

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

Adding to 21031200223 its reverse (32200213012), we get a palindrome (53231413235).

The spelling of 21031200223 in words is "twenty-one billion, thirty-one million, two hundred thousand, two hundred twenty-three".