21033342023 has 4 divisors (see below), whose sum is σ = 21034884480. Its totient is φ = 21031799568.

The previous prime is 21033342017. The next prime is 21033342047. The reversal of 21033342023 is 32024333012.

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 21033342023 - 2²² = 21029147719 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 21033342023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033342073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 750590 + ... + 778107.

It is an arithmetic number, because the mean of its divisors is an integer number (5258721120).

Almost surely, 2^21033342023 is an apocalyptic number.

21033342023 is a deficient number, since it is larger than the sum of its proper divisors (1542457).

21033342023 is a wasteful number, since it uses less digits than its factorization.

21033342023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542456.

The product of its (nonzero) digits is 2592, while the sum is 23.

Adding to 21033342023 its reverse (32024333012), we get a palindrome (53057675035).

The spelling of 21033342023 in words is "twenty-one billion, thirty-three million, three hundred forty-two thousand, twenty-three".