21660048812 has 12 divisors (see below), whose sum is σ = 39127830336. Its totient is φ = 10480668720.

The previous prime is 21660048803. The next prime is 21660048821. The reversal of 21660048812 is 21884006612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21660048803) and next prime (21660048821).

It is a super-4 number, since 4×21660048812⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87338783 + ... + 87339030.

It is an arithmetic number, because the mean of its divisors is an integer number (3260652528).

Almost surely, 2^21660048812 is an apocalyptic number.

It is an amenable number.

21660048812 is a deficient number, since it is larger than the sum of its proper divisors (17467781524).

21660048812 is a wasteful number, since it uses less digits than its factorization.

21660048812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174677848 (or 174677846 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The spelling of 21660048812 in words is "twenty-one billion, six hundred sixty million, forty-eight thousand, eight hundred twelve".