21066461606512 has 60 divisors (see below), whose sum is σ = 47915747976360. Its totient is φ = 8945653385088.

The previous prime is 21066461606503. The next prime is 21066461606557. The reversal of 21066461606512 is 21560616466012.

It is a super-2 number, since 2×21066461606512² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123173658 + ... + 123344569.

It is an arithmetic number, because the mean of its divisors is an integer number (798595799606).

Almost surely, 2^{21066461606512} is an apocalyptic number.

It is an amenable number.

21066461606512 is an abundant number, since it is smaller than the sum of its proper divisors (26849286369848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21066461606512 is a wasteful number, since it uses less digits than its factorization.

21066461606512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246518358 (or 246518345 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 21066461606512 in words is "twenty-one trillion, sixty-six billion, four hundred sixty-one million, six hundred six thousand, five hundred twelve".