171069921 has 24 divisors (see below), whose sum is σ = 278576480. Its totient is φ = 103676760.

The previous prime is 171069911. The next prime is 171069923. The reversal of 171069921 is 129960171.

It is not a de Polignac number, because 171069921 - 2¹⁰ = 171068897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171069923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22915 + ... + 29448.

Almost surely, 2^171069921 is an apocalyptic number.

171069921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

171069921 is a deficient number, since it is larger than the sum of its proper divisors (107506559).

171069921 is a wasteful number, since it uses less digits than its factorization.

171069921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52394 (or 52377 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 36.

The square root of 171069921 is about 13079.3700536379. The cubic root of 171069921 is about 555.1255523112.

It can be divided in two parts, 1710 and 69921, that added together give a triangular number (71631 = T₃₇₈).

The spelling of 171069921 in words is "one hundred seventy-one million, sixty-nine thousand, nine hundred twenty-one".