21321203023 has 8 divisors (see below), whose sum is σ = 21401377200. Its totient is φ = 21241079808.

The previous prime is 21321203017. The next prime is 21321203107. The reversal of 21321203023 is 32030212312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321203023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321203923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 964468 + ... + 986326.

It is an arithmetic number, because the mean of its divisors is an integer number (2675172150).

Almost surely, 2^21321203023 is an apocalyptic number.

21321203023 is a deficient number, since it is larger than the sum of its proper divisors (80174177).

21321203023 is a wasteful number, since it uses less digits than its factorization.

21321203023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25481.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21321203023 its reverse (32030212312), we get a palindrome (53351415335).

The spelling of 21321203023 in words is "twenty-one billion, three hundred twenty-one million, two hundred three thousand, twenty-three".