21012003223 has 8 divisors (see below), whose sum is σ = 21987065088. Its totient is φ = 20058371424.

The previous prime is 21012003167. The next prime is 21012003239. The reversal of 21012003223 is 32230021012.

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

It is a cyclic number.

It is not a de Polignac number, because 21012003223 - 2¹⁷ = 21011872151 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012003197 and 21012003206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012003283) 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, 5355511 + ... + 5359432.

It is an arithmetic number, because the mean of its divisors is an integer number (2748383136).

Almost surely, 2^21012003223 is an apocalyptic number.

21012003223 is a deficient number, since it is larger than the sum of its proper divisors (975061865).

21012003223 is a wasteful number, since it uses less digits than its factorization.

21012003223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10715033.

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

Adding to 21012003223 its reverse (32230021012), we get a palindrome (53242024235).

The spelling of 21012003223 in words is "twenty-one billion, twelve million, three thousand, two hundred twenty-three".