21875448771 has 72 divisors (see below), whose sum is σ = 37269938160. Its totient is φ = 12252902400.

The previous prime is 21875448767. The next prime is 21875448779. The reversal of 21875448771 is 17784457812.

It is a happy number.

21875448771 is a `hidden beast` number, since 2 + 18 + 7 + 544 + 87 + 7 + 1 = 666.

It is not a de Polignac number, because 21875448771 - 2² = 21875448767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21875448779) 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 71 ways as a sum of consecutive naturals, for example, 1457835 + ... + 1472763.

It is an arithmetic number, because the mean of its divisors is an integer number (517638030).

Almost surely, 2^21875448771 is an apocalyptic number.

21875448771 is a deficient number, since it is larger than the sum of its proper divisors (15394489389).

21875448771 is a wasteful number, since it uses less digits than its factorization.

21875448771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15025 (or 15003 counting only the distinct ones).

The product of its digits is 3512320, while the sum is 54.

The spelling of 21875448771 in words is "twenty-one billion, eight hundred seventy-five million, four hundred forty-eight thousand, seven hundred seventy-one".