21446321238 has 40 divisors (see below), whose sum is σ = 48253494168. Its totient is φ = 7148760624.

The previous prime is 21446321213. The next prime is 21446321243. The reversal of 21446321238 is 83212364412.

21446321238 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 632 + 12 + 3 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 233031 + ... + 311762.

Almost surely, 2^21446321238 is an apocalyptic number.

21446321238 is an abundant number, since it is smaller than the sum of its proper divisors (26807172930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21446321238 is an frugal number, since it uses more digits than its factorization.

21446321238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544822 (or 544798 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The spelling of 21446321238 in words is "twenty-one billion, four hundred forty-six million, three hundred twenty-one thousand, two hundred thirty-eight".