21802153156671 has 16 divisors (see below), whose sum is σ = 29746115848064. Its totient is φ = 14196491949024.

The previous prime is 21802153156643. The next prime is 21802153156673. The reversal of 21802153156671 is 17665135120812.

It is not a de Polignac number, because 21802153156671 - 2⁵ = 21802153156639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21802153156671.

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 15 ways as a sum of consecutive naturals, for example, 5689560 + ... + 8716386.

It is an arithmetic number, because the mean of its divisors is an integer number (1859132240504).

Almost surely, 2^{21802153156671} is an apocalyptic number.

21802153156671 is a deficient number, since it is larger than the sum of its proper divisors (7943962691393).

21802153156671 is a wasteful number, since it uses less digits than its factorization.

21802153156671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082710.

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 21802153156671 in words is "twenty-one trillion, eight hundred two billion, one hundred fifty-three million, one hundred fifty-six thousand, six hundred seventy-one".