21866712306 has 32 divisors (see below), whose sum is σ = 46605846528. Its totient is φ = 6823652880.

The previous prime is 21866712293. The next prime is 21866712323. The reversal of 21866712306 is 60321766812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1679200 + ... + 1692171.

It is an arithmetic number, because the mean of its divisors is an integer number (1456432704).

Almost surely, 2^21866712306 is an apocalyptic number.

21866712306 is an abundant number, since it is smaller than the sum of its proper divisors (24739134222).

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

21866712306 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 21866712306 = (62387062116)₉.

21866712306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371446.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 21866712306 in words is "twenty-one billion, eight hundred sixty-six million, seven hundred twelve thousand, three hundred six".