21073658170 has 8 divisors (see below), whose sum is σ = 37932584724. Its totient is φ = 8429463264.

The previous prime is 21073658153. The next prime is 21073658191. The reversal of 21073658170 is 7185637012.

21073658170 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 21028190121 + 45468049 = 145011^2 + 6743^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1053682899 + ... + 1053682918.

Almost surely, 2^21073658170 is an apocalyptic number.

21073658170 is a deficient number, since it is larger than the sum of its proper divisors (16858926554).

21073658170 is a wasteful number, since it uses less digits than its factorization.

21073658170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107365824.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 21073658170 in words is "twenty-one billion, seventy-three million, six hundred fifty-eight thousand, one hundred seventy".