21765712306 has 64 divisors (see below), whose sum is σ = 37702748160. Its totient is φ = 9334932480.

The previous prime is 21765712277. The next prime is 21765712313. The reversal of 21765712306 is 60321756712.

21765712306 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17680711 + ... + 17681941.

It is an arithmetic number, because the mean of its divisors is an integer number (589105440).

Almost surely, 2^21765712306 is an apocalyptic number.

21765712306 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21765712306 is a deficient number, since it is larger than the sum of its proper divisors (15937035854).

21765712306 is a wasteful number, since it uses less digits than its factorization.

21765712306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739.

The product of its (nonzero) digits is 105840, while the sum is 40.

The spelling of 21765712306 in words is "twenty-one billion, seven hundred sixty-five million, seven hundred twelve thousand, three hundred six".