21258466166008 has 32 divisors (see below), whose sum is σ = 39965912064000. Its totient is φ = 10600891187040.

The previous prime is 21258466165991. The next prime is 21258466166009. The reversal of 21258466166008 is 80066166485212.

It is a self number, because there is not a number n which added to its sum of digits gives 21258466166008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21258466166009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142608393 + ... + 142757383.

It is an arithmetic number, because the mean of its divisors is an integer number (1248934752000).

Almost surely, 2^{21258466166008} is an apocalyptic number.

It is an amenable number.

21258466166008 is a deficient number, since it is larger than the sum of its proper divisors (18707445897992).

21258466166008 is a wasteful number, since it uses less digits than its factorization.

21258466166008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196435 (or 196431 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 55.

The spelling of 21258466166008 in words is "twenty-one trillion, two hundred fifty-eight billion, four hundred sixty-six million, one hundred sixty-six thousand, eight".