21080289016 has 8 divisors (see below), whose sum is σ = 39525541920. Its totient is φ = 10540144504.

The previous prime is 21080289001. The next prime is 21080289019. The reversal of 21080289016 is 61098208012.

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 not an unprimeable number, because it can be changed into a prime (21080289019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1317518056 + ... + 1317518071.

It is an arithmetic number, because the mean of its divisors is an integer number (4940692740).

Almost surely, 2^21080289016 is an apocalyptic number.

It is an amenable number.

21080289016 is a deficient number, since it is larger than the sum of its proper divisors (18445252904).

21080289016 is a wasteful number, since it uses less digits than its factorization.

21080289016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635036133 (or 2635036129 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 21080289016 in words is "twenty-one billion, eighty million, two hundred eighty-nine thousand, sixteen".