21861416812 has 12 divisors (see below), whose sum is σ = 38718413496. Its totient is φ = 10799012960.

The previous prime is 21861416803. The next prime is 21861416831.

21861416812 is nontrivially palindromic in base 10.

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 3 ways as a sum of consecutive naturals, for example, 32923489 + ... + 32924152.

It is an arithmetic number, because the mean of its divisors is an integer number (3226534458).

Almost surely, 2^21861416812 is an apocalyptic number.

It is an amenable number.

21861416812 is a deficient number, since it is larger than the sum of its proper divisors (16856996684).

21861416812 is a wasteful number, since it uses less digits than its factorization.

21861416812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65847728 (or 65847726 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The spelling of 21861416812 in words is "twenty-one billion, eight hundred sixty-one million, four hundred sixteen thousand, eight hundred twelve".