21231333023 has 4 divisors (see below), whose sum is σ = 21241956000. Its totient is φ = 21220710048.

The previous prime is 21231332977. The next prime is 21231333037. The reversal of 21231333023 is 32033313212.

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 21231333023 - 2¹² = 21231328927 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 21231333023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231333043) 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, 5308490 + ... + 5312487.

It is an arithmetic number, because the mean of its divisors is an integer number (5310489000).

Almost surely, 2^21231333023 is an apocalyptic number.

21231333023 is a deficient number, since it is larger than the sum of its proper divisors (10622977).

21231333023 is a wasteful number, since it uses less digits than its factorization.

21231333023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10622976.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21231333023 its reverse (32033313212), we get a palindrome (53264646235).

The spelling of 21231333023 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-three thousand, twenty-three".