21102012223 has 8 divisors (see below), whose sum is σ = 21299571216. Its totient is φ = 20904643200.

The previous prime is 21102012203. The next prime is 21102012227. The reversal of 21102012223 is 32221020112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102012223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21102012197 and 21102012206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102012227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180813 + ... + 273673.

It is an arithmetic number, because the mean of its divisors is an integer number (2662446402).

Almost surely, 2^21102012223 is an apocalyptic number.

21102012223 is a deficient number, since it is larger than the sum of its proper divisors (197558993).

21102012223 is a wasteful number, since it uses less digits than its factorization.

21102012223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94985.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21102012223 its reverse (32221020112), we get a palindrome (53323032335).

The spelling of 21102012223 in words is "twenty-one billion, one hundred two million, twelve thousand, two hundred twenty-three".