21072560016164 has 12 divisors (see below), whose sum is σ = 39046214147724. Its totient is φ = 9916498831104.

The previous prime is 21072560016127. The next prime is 21072560016187. The reversal of 21072560016164 is 46161006527012.

It can be written as a sum of positive squares in 2 ways, for example, as 15298189464100 + 5774370552064 = 3911290^2 + 2402992^2 .

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, 154945294169 + ... + 154945294304.

It is an arithmetic number, because the mean of its divisors is an integer number (3253851178977).

Almost surely, 2^{21072560016164} is an apocalyptic number.

It is an amenable number.

21072560016164 is a deficient number, since it is larger than the sum of its proper divisors (17973654131560).

21072560016164 is a wasteful number, since it uses less digits than its factorization.

21072560016164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309890588494 (or 309890588492 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 21072560016164 in words is "twenty-one trillion, seventy-two billion, five hundred sixty million, sixteen thousand, one hundred sixty-four".