16656021212 has 6 divisors (see below), whose sum is σ = 29148037128. Its totient is φ = 8328010604.

The previous prime is 16656021181. The next prime is 16656021227. The reversal of 16656021212 is 21212065661.

It is a super-2 number, since 2×16656021212² (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 (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2082002648 + ... + 2082002655.

It is an arithmetic number, because the mean of its divisors is an integer number (4858006188).

Almost surely, 2^16656021212 is an apocalyptic number.

It is an amenable number.

16656021212 is a deficient number, since it is larger than the sum of its proper divisors (12492015916).

16656021212 is a wasteful number, since it uses less digits than its factorization.

16656021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4164005307 (or 4164005305 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

Adding to 16656021212 its reverse (21212065661), we get a palindrome (37868086873).

The spelling of 16656021212 in words is "sixteen billion, six hundred fifty-six million, twenty-one thousand, two hundred twelve".