21404322023 has 4 divisors (see below), whose sum is σ = 24462082320. Its totient is φ = 18346561728.

The previous prime is 21404322013. The next prime is 21404322041. The reversal of 21404322023 is 32022340412.

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 21404322023 - 2²⁰ = 21403273447 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 21404322023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404322013) 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, 1528880138 + ... + 1528880151.

It is an arithmetic number, because the mean of its divisors is an integer number (6115520580).

Almost surely, 2^21404322023 is an apocalyptic number.

21404322023 is a deficient number, since it is larger than the sum of its proper divisors (3057760297).

21404322023 is an equidigital number, since it uses as much as digits as its factorization.

21404322023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057760296.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21404322023 its reverse (32022340412), we get a palindrome (53426662435).

The spelling of 21404322023 in words is "twenty-one billion, four hundred four million, three hundred twenty-two thousand, twenty-three".