21668342152 has 32 divisors (see below), whose sum is σ = 40956854400. Its totient is φ = 10746590400.

The previous prime is 21668342117. The next prime is 21668342161. The reversal of 21668342152 is 25124386612.

It is a super-2 number, since 2×21668342152² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3708049 + ... + 3713887.

It is an arithmetic number, because the mean of its divisors is an integer number (1279901700).

Almost surely, 2^21668342152 is an apocalyptic number.

It is an amenable number.

21668342152 is a deficient number, since it is larger than the sum of its proper divisors (19288512248).

21668342152 is a wasteful number, since it uses less digits than its factorization.

21668342152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9517 (or 9513 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The spelling of 21668342152 in words is "twenty-one billion, six hundred sixty-eight million, three hundred forty-two thousand, one hundred fifty-two".