21021023223023 has 16 divisors (see below), whose sum is σ = 22469813963520. Its totient is φ = 19606796516736.

The previous prime is 21021023223007. The next prime is 21021023223029. The reversal of 21021023223023 is 32032232012012.

It is a cyclic number.

It is not a de Polignac number, because 21021023223023 - 2⁴ = 21021023223007 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 21021023223023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021023223029) 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, 2118986 + ... + 6821447.

It is an arithmetic number, because the mean of its divisors is an integer number (1404363372720).

Almost surely, 2^{21021023223023} is an apocalyptic number.

21021023223023 is a deficient number, since it is larger than the sum of its proper divisors (1448790740497).

21021023223023 is a wasteful number, since it uses less digits than its factorization.

21021023223023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8942366.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21021023223023 its reverse (32032232012012), we get a palindrome (53053255235035).

The spelling of 21021023223023 in words is "twenty-one trillion, twenty-one billion, twenty-three million, two hundred twenty-three thousand, twenty-three".