21012102223 has 8 divisors (see below), whose sum is σ = 25277717120. Its totient is φ = 17062458840.

The previous prime is 21012102211. The next prime is 21012102239. The reversal of 21012102223 is 32220121012.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-21012102223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012102197 and 21012102206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012102283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78992733 + ... + 78992998.

It is an arithmetic number, because the mean of its divisors is an integer number (3159714640).

Almost surely, 2^21012102223 is an apocalyptic number.

21012102223 is a deficient number, since it is larger than the sum of its proper divisors (4265614897).

21012102223 is a wasteful number, since it uses less digits than its factorization.

21012102223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157985757.

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

Adding to 21012102223 its reverse (32220121012), we get a palindrome (53232223235).

The spelling of 21012102223 in words is "twenty-one billion, twelve million, one hundred two thousand, two hundred twenty-three".