21277765676 has 48 divisors (see below), whose sum is σ = 40409698560. Its totient is φ = 9768911040.

The previous prime is 21277765669. The next prime is 21277765721. The reversal of 21277765676 is 67656777212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 725171 + ... + 753941.

It is an arithmetic number, because the mean of its divisors is an integer number (841868720).

Almost surely, 2^21277765676 is an apocalyptic number.

It is an amenable number.

21277765676 is a deficient number, since it is larger than the sum of its proper divisors (19131932884).

21277765676 is a wasteful number, since it uses less digits than its factorization.

21277765676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29094 (or 29092 counting only the distinct ones).

The product of its digits is 10372320, while the sum is 56.

The spelling of 21277765676 in words is "twenty-one billion, two hundred seventy-seven million, seven hundred sixty-five thousand, six hundred seventy-six".