173708811221 has 16 divisors (see below), whose sum is σ = 191292496128. Its totient is φ = 156425472000.

The previous prime is 173708811197. The next prime is 173708811223. The reversal of 173708811221 is 122118807371.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-173708811221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173708811223) 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, 2068196 + ... + 2150546.

It is an arithmetic number, because the mean of its divisors is an integer number (11955781008).

Almost surely, 2^173708811221 is an apocalyptic number.

173708811221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

173708811221 is a deficient number, since it is larger than the sum of its proper divisors (17583684907).

173708811221 is a wasteful number, since it uses less digits than its factorization.

173708811221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84172.

The product of its (nonzero) digits is 37632, while the sum is 41.

The spelling of 173708811221 in words is "one hundred seventy-three billion, seven hundred eight million, eight hundred eleven thousand, two hundred twenty-one".