21339576838 has 4 divisors (see below), whose sum is σ = 32009365260. Its totient is φ = 10669788418.

The previous prime is 21339576829. The next prime is 21339576887. The reversal of 21339576838 is 83867593312.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5334894208 + ... + 5334894211.

It is an arithmetic number, because the mean of its divisors is an integer number (8002341315).

Almost surely, 2^21339576838 is an apocalyptic number.

21339576838 is a deficient number, since it is larger than the sum of its proper divisors (10669788422).

21339576838 is a wasteful number, since it uses less digits than its factorization.

21339576838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10669788421.

The product of its digits is 6531840, while the sum is 55.

The spelling of 21339576838 in words is "twenty-one billion, three hundred thirty-nine million, five hundred seventy-six thousand, eight hundred thirty-eight".