21802153156670 has 16 divisors (see below), whose sum is σ = 39277388833488. Its totient is φ = 8713413895680.

The previous prime is 21802153156643. The next prime is 21802153156673. The reversal of 21802153156670 is 7665135120812.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21802153156673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 930908579 + ... + 930931998.

It is an arithmetic number, because the mean of its divisors is an integer number (2454836802093).

Almost surely, 2^{21802153156670} is an apocalyptic number.

21802153156670 is a deficient number, since it is larger than the sum of its proper divisors (17475235676818).

21802153156670 is a wasteful number, since it uses less digits than its factorization.

21802153156670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1861841755.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 21802153156670 in words is "twenty-one trillion, eight hundred two billion, one hundred fifty-three million, one hundred fifty-six thousand, six hundred seventy".