21712570838 has 16 divisors (see below), whose sum is σ = 37232537760. Its totient is φ = 9302640576.

The previous prime is 21712570823. The next prime is 21712570879. The reversal of 21712570838 is 83807521712.

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 in 7 ways as a sum of consecutive naturals, for example, 179423 + ... + 274986.

It is an arithmetic number, because the mean of its divisors is an integer number (2327033610).

Almost surely, 2^21712570838 is an apocalyptic number.

21712570838 is a deficient number, since it is larger than the sum of its proper divisors (15519966922).

21712570838 is a wasteful number, since it uses less digits than its factorization.

21712570838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457831.

The product of its (nonzero) digits is 188160, while the sum is 44.

The spelling of 21712570838 in words is "twenty-one billion, seven hundred twelve million, five hundred seventy thousand, eight hundred thirty-eight".