21946664912 has 80 divisors (see below), whose sum is σ = 43869942144. Its totient is φ = 10632000000.

The previous prime is 21946664893. The next prime is 21946664933.

21946664912 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21946664912² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 24742133 + ... + 24743019.

Almost surely, 2^21946664912 is an apocalyptic number.

It is an amenable number.

21946664912 is a deficient number, since it is larger than the sum of its proper divisors (21923277232).

21946664912 is a wasteful number, since it uses less digits than its factorization.

21946664912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308 (or 1302 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The spelling of 21946664912 in words is "twenty-one billion, nine hundred forty-six million, six hundred sixty-four thousand, nine hundred twelve".