21438468326 has 16 divisors (see below), whose sum is σ = 35130635280. Its totient is φ = 9731006880.

The previous prime is 21438468323. The next prime is 21438468329. The reversal of 21438468326 is 62386483412.

It is an interprime number because it is at equal distance from previous prime (21438468323) and next prime (21438468329).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21438468323) 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 7 ways as a sum of consecutive naturals, for example, 671621 + ... + 702816.

It is an arithmetic number, because the mean of its divisors is an integer number (2195664705).

Almost surely, 2^21438468326 is an apocalyptic number.

21438468326 is a deficient number, since it is larger than the sum of its proper divisors (13692166954).

21438468326 is a wasteful number, since it uses less digits than its factorization.

21438468326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375159.

The product of its digits is 1327104, while the sum is 47.

The spelling of 21438468326 in words is "twenty-one billion, four hundred thirty-eight million, four hundred sixty-eight thousand, three hundred twenty-six".