21030020231223 has 16 divisors (see below), whose sum is σ = 28395358323200. Its totient is φ = 13842352742400.

The previous prime is 21030020231141. The next prime is 21030020231237. The reversal of 21030020231223 is 32213202003012.

It is a happy number.

It is not a de Polignac number, because 21030020231223 - 2¹² = 21030020227127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21030020231223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030020231263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17624148 + ... + 18779526.

It is an arithmetic number, because the mean of its divisors is an integer number (1774709895200).

Almost surely, 2^{21030020231223} is an apocalyptic number.

21030020231223 is a deficient number, since it is larger than the sum of its proper divisors (7365338091977).

21030020231223 is a wasteful number, since it uses less digits than its factorization.

21030020231223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232262.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21030020231223 its reverse (32213202003012), we get a palindrome (53243222234235).

The spelling of 21030020231223 in words is "twenty-one trillion, thirty billion, twenty million, two hundred thirty-one thousand, two hundred twenty-three".