21765780696 has 32 divisors (see below), whose sum is σ = 59361220800. Its totient is φ = 6595691040.

The previous prime is 21765780623. The next prime is 21765780769. The reversal of 21765780696 is 69608756712.

It is an interprime number because it is at equal distance from previous prime (21765780623) and next prime (21765780769).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41222806 + ... + 41223333.

It is an arithmetic number, because the mean of its divisors is an integer number (1855038150).

Almost surely, 2^21765780696 is an apocalyptic number.

It is an amenable number.

21765780696 is an abundant number, since it is smaller than the sum of its proper divisors (37595440104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21765780696 is a wasteful number, since it uses less digits than its factorization.

21765780696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82446159 (or 82446155 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 57.

The spelling of 21765780696 in words is "twenty-one billion, seven hundred sixty-five million, seven hundred eighty thousand, six hundred ninety-six".