170021139 has 8 divisors (see below), whose sum is σ = 238626240. Its totient is φ = 107381736.

The previous prime is 170021107. The next prime is 170021141. The reversal of 170021139 is 931120071.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 170021139 - 2⁵ = 170021107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (170021149) 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, 1491357 + ... + 1491470.

It is an arithmetic number, because the mean of its divisors is an integer number (29828280).

Almost surely, 2^170021139 is an apocalyptic number.

170021139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

170021139 is a deficient number, since it is larger than the sum of its proper divisors (68605101).

170021139 is a wasteful number, since it uses less digits than its factorization.

170021139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2982849.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 170021139 is about 13039.2154288515. The cubic root of 170021139 is about 553.9887860642.

The spelling of 170021139 in words is "one hundred seventy million, twenty-one thousand, one hundred thirty-nine".