21002012223 has 16 divisors (see below), whose sum is σ = 28480097280. Its totient is φ = 13763509056.

The previous prime is 21002012209. The next prime is 21002012237. The reversal of 21002012223 is 32221020012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21002012209) and next prime (21002012237).

It is not a de Polignac number, because 21002012223 - 2¹⁷ = 21001881151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002052223) 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 15 ways as a sum of consecutive naturals, for example, 12790 + ... + 205347.

It is an arithmetic number, because the mean of its divisors is an integer number (1780006080).

Almost surely, 2^21002012223 is an apocalyptic number.

21002012223 is a deficient number, since it is larger than the sum of its proper divisors (7478085057).

21002012223 is a wasteful number, since it uses less digits than its factorization.

21002012223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218686.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21002012223 its reverse (32221020012), we get a palindrome (53223032235).

The spelling of 21002012223 in words is "twenty-one billion, two million, twelve thousand, two hundred twenty-three".