21066083128 has 8 divisors (see below), whose sum is σ = 39498905880. Its totient is φ = 10533041560.

The previous prime is 21066083081. The next prime is 21066083131. The reversal of 21066083128 is 82138066012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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, 1316630188 + ... + 1316630203.

It is an arithmetic number, because the mean of its divisors is an integer number (4937363235).

Almost surely, 2^21066083128 is an apocalyptic number.

It is an amenable number.

21066083128 is a deficient number, since it is larger than the sum of its proper divisors (18432822752).

21066083128 is a wasteful number, since it uses less digits than its factorization.

21066083128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2633260397 (or 2633260393 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The spelling of 21066083128 in words is "twenty-one billion, sixty-six million, eighty-three thousand, one hundred twenty-eight".