21605152216670 has 16 divisors (see below), whose sum is σ = 42424662534768. Its totient is φ = 7856418987840.

The previous prime is 21605152216667. The next prime is 21605152216723. The reversal of 21605152216670 is 7661225150612.

It is a super-2 number, since 2×21605152216670² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98205237239 + ... + 98205237458.

It is an arithmetic number, because the mean of its divisors is an integer number (2651541408423).

Almost surely, 2^{21605152216670} is an apocalyptic number.

21605152216670 is a deficient number, since it is larger than the sum of its proper divisors (20819510318098).

21605152216670 is a wasteful number, since it uses less digits than its factorization.

21605152216670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196410474715.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 21605152216670 in words is "twenty-one trillion, six hundred five billion, one hundred fifty-two million, two hundred sixteen thousand, six hundred seventy".