21516165705016 has 16 divisors (see below), whose sum is σ = 40346303451840. Its totient is φ = 10757151451200.

The previous prime is 21516165704983. The next prime is 21516165705059. The reversal of 21516165705016 is 61050756161512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116326981 + ... + 116511796.

It is an arithmetic number, because the mean of its divisors is an integer number (2521643965740).

Almost surely, 2^{21516165705016} is an apocalyptic number.

It is an amenable number.

21516165705016 is a deficient number, since it is larger than the sum of its proper divisors (18830137746824).

21516165705016 is a wasteful number, since it uses less digits than its factorization.

21516165705016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232850334 (or 232850330 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 46.

The spelling of 21516165705016 in words is "twenty-one trillion, five hundred sixteen billion, one hundred sixty-five million, seven hundred five thousand, sixteen".