20871976321 has 8 divisors (see below), whose sum is σ = 25256845440. Its totient is φ = 16837896768.

The previous prime is 20871976319. The next prime is 20871976337. The reversal of 20871976321 is 12367917802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20871976321 - 2¹ = 20871976319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20871976921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87697261 + ... + 87697498.

It is an arithmetic number, because the mean of its divisors is an integer number (3157105680).

Almost surely, 2^20871976321 is an apocalyptic number.

It is an amenable number.

20871976321 is a deficient number, since it is larger than the sum of its proper divisors (4384869119).

20871976321 is a wasteful number, since it uses less digits than its factorization.

20871976321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175394783.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 20871976321 in words is "twenty billion, eight hundred seventy-one million, nine hundred seventy-six thousand, three hundred twenty-one".