21002223423 has 8 divisors (see below), whose sum is σ = 28010343168. Its totient is φ = 13997792984.

The previous prime is 21002223421. The next prime is 21002223433. The reversal of 21002223423 is 32432220012.

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 21002223423 - 2¹ = 21002223421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21002223423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002223421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 909015 + ... + 931832.

It is an arithmetic number, because the mean of its divisors is an integer number (3501292896).

Almost surely, 2^21002223423 is an apocalyptic number.

21002223423 is a deficient number, since it is larger than the sum of its proper divisors (7008119745).

21002223423 is a wasteful number, since it uses less digits than its factorization.

21002223423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844653.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21002223423 its reverse (32432220012), we get a palindrome (53434443435).

The spelling of 21002223423 in words is "twenty-one billion, two million, two hundred twenty-three thousand, four hundred twenty-three".