21210332023 has 4 divisors (see below), whose sum is σ = 21221421408. Its totient is φ = 21199242640.

The previous prime is 21210332009. The next prime is 21210332051. The reversal of 21210332023 is 32023301212.

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 21210332023 - 2⁵ = 21210331991 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 (21210332083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5541823 + ... + 5545648.

It is an arithmetic number, because the mean of its divisors is an integer number (5305355352).

Almost surely, 2^21210332023 is an apocalyptic number.

21210332023 is a deficient number, since it is larger than the sum of its proper divisors (11089385).

21210332023 is a wasteful number, since it uses less digits than its factorization.

21210332023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11089384.

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

Adding to 21210332023 its reverse (32023301212), we get a palindrome (53233633235).

The spelling of 21210332023 in words is "twenty-one billion, two hundred ten million, three hundred thirty-two thousand, twenty-three".