21010566610945 has 16 divisors (see below), whose sum is σ = 25243298910720. Its totient is φ = 16788048609600.

The previous prime is 21010566610937. The next prime is 21010566610991. The reversal of 21010566610945 is 54901666501012.

It is a happy number.

It is not a de Polignac number, because 21010566610945 - 2³ = 21010566610937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010566610895 and 21010566610904.

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, 20696491 + ... + 21687919.

It is an arithmetic number, because the mean of its divisors is an integer number (1577706181920).

Almost surely, 2^{21010566610945} is an apocalyptic number.

It is an amenable number.

21010566610945 is a deficient number, since it is larger than the sum of its proper divisors (4232732299775).

21010566610945 is a wasteful number, since it uses less digits than its factorization.

21010566610945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996576.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 21010566610945 in words is "twenty-one trillion, ten billion, five hundred sixty-six million, six hundred ten thousand, nine hundred forty-five".