21066355962216 has 64 divisors (see below), whose sum is σ = 58538805523200. Its totient is φ = 7019580645504.

The previous prime is 21066355962181. The next prime is 21066355962257. The reversal of 21066355962216 is 61226955366012.

21066355962216 is a `hidden beast` number, since 2 + 1 + 0 + 6 + 6 + 3 + 5 + 5 + 9 + 622 + 1 + 6 = 666.

It is a super-2 number, since 2×21066355962216² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17026005 + ... + 18221348.

It is an arithmetic number, because the mean of its divisors is an integer number (914668836300).

Almost surely, 2^{21066355962216} is an apocalyptic number.

It is an amenable number.

21066355962216 is an abundant number, since it is smaller than the sum of its proper divisors (37472449560984).

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

21066355962216 is a wasteful number, since it uses less digits than its factorization.

21066355962216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35250135 (or 35250125 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 54.

The spelling of 21066355962216 in words is "twenty-one trillion, sixty-six billion, three hundred fifty-five million, nine hundred sixty-two thousand, two hundred sixteen".