21323100321023 has 4 divisors (see below), whose sum is σ = 21424157668728. Its totient is φ = 21222042973320.

The previous prime is 21323100320987. The next prime is 21323100321109. The reversal of 21323100321023 is 32012300132312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21323100321023 - 2²² = 21323096126719 is a prime.

It is a super-2 number, since 2×21323100321023² (a number of 27 digits) contains 22 as substring.

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 21323100321023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323100321223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50528673536 + ... + 50528673957.

It is an arithmetic number, because the mean of its divisors is an integer number (5356039417182).

Almost surely, 2^{21323100321023} is an apocalyptic number.

21323100321023 is a deficient number, since it is larger than the sum of its proper divisors (101057347705).

21323100321023 is a wasteful number, since it uses less digits than its factorization.

21323100321023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101057347704.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21323100321023 its reverse (32012300132312), we get a palindrome (53335400453335).

The spelling of 21323100321023 in words is "twenty-one trillion, three hundred twenty-three billion, one hundred million, three hundred twenty-one thousand, twenty-three".