21765406076 has 12 divisors (see below), whose sum is σ = 39402890520. Its totient is φ = 10507437360.

The previous prime is 21765406073. The next prime is 21765406093. The reversal of 21765406076 is 67060456712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21765406073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93816290 + ... + 93816521.

It is an arithmetic number, because the mean of its divisors is an integer number (3283574210).

Almost surely, 2^21765406076 is an apocalyptic number.

It is an amenable number.

21765406076 is a deficient number, since it is larger than the sum of its proper divisors (17637484444).

21765406076 is a wasteful number, since it uses less digits than its factorization.

21765406076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187632844 (or 187632842 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 21765406076 in words is "twenty-one billion, seven hundred sixty-five million, four hundred six thousand, seventy-six".