21163422776 has 8 divisors (see below), whose sum is σ = 39681417720. Its totient is φ = 10581711384.

The previous prime is 21163422737. The next prime is 21163422793. The reversal of 21163422776 is 67722436112.

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, 1322713916 + ... + 1322713931.

It is an arithmetic number, because the mean of its divisors is an integer number (4960177215).

Almost surely, 2^21163422776 is an apocalyptic number.

It is an amenable number.

21163422776 is a deficient number, since it is larger than the sum of its proper divisors (18517994944).

21163422776 is a wasteful number, since it uses less digits than its factorization.

21163422776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645427853 (or 2645427849 counting only the distinct ones).

The product of its digits is 169344, while the sum is 41.

Adding to 21163422776 its reverse (67722436112), we get a palindrome (88885858888).

The spelling of 21163422776 in words is "twenty-one billion, one hundred sixty-three million, four hundred twenty-two thousand, seven hundred seventy-six".