21002023202223 has 64 divisors (see below), whose sum is σ = 32906334827520. Its totient is φ = 11667975340032.

The previous prime is 21002023202117. The next prime is 21002023202291. The reversal of 21002023202223 is 32220232020012.

It is not a de Polignac number, because 21002023202223 - 2¹⁷ = 21002023071151 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21002023202223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002023201223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39147865 + ... + 39680717.

It is an arithmetic number, because the mean of its divisors is an integer number (514161481680).

Almost surely, 2^{21002023202223} is an apocalyptic number.

21002023202223 is a deficient number, since it is larger than the sum of its proper divisors (11904311625297).

21002023202223 is a wasteful number, since it uses less digits than its factorization.

21002023202223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533296.

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

Adding to 21002023202223 its reverse (32220232020012), we get a palindrome (53222255222235).

The spelling of 21002023202223 in words is "twenty-one trillion, two billion, twenty-three million, two hundred two thousand, two hundred twenty-three".