21861086776 has 8 divisors (see below), whose sum is σ = 40989537720. Its totient is φ = 10930543384.

The previous prime is 21861086729. The next prime is 21861086809. The reversal of 21861086776 is 67768016812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1366317916 + ... + 1366317931.

It is an arithmetic number, because the mean of its divisors is an integer number (5123692215).

Almost surely, 2^21861086776 is an apocalyptic number.

It is an amenable number.

21861086776 is a deficient number, since it is larger than the sum of its proper divisors (19128450944).

21861086776 is a wasteful number, since it uses less digits than its factorization.

21861086776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732635853 (or 2732635849 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 21861086776 in words is "twenty-one billion, eight hundred sixty-one million, eighty-six thousand, seven hundred seventy-six".