21335342023 has 4 divisors (see below), whose sum is σ = 22590362160. Its totient is φ = 20080321888.

The previous prime is 21335342011. The next prime is 21335342033. The reversal of 21335342023 is 32024353312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21335342023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21335341982 and 21335342000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335342033) 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, 627510043 + ... + 627510076.

It is an arithmetic number, because the mean of its divisors is an integer number (5647590540).

Almost surely, 2^21335342023 is an apocalyptic number.

21335342023 is a deficient number, since it is larger than the sum of its proper divisors (1255020137).

21335342023 is a wasteful number, since it uses less digits than its factorization.

21335342023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255020136.

The product of its (nonzero) digits is 12960, while the sum is 28.

Adding to 21335342023 its reverse (32024353312), we get a palindrome (53359695335).

The spelling of 21335342023 in words is "twenty-one billion, three hundred thirty-five million, three hundred forty-two thousand, twenty-three".