170121432 has 128 divisors (see below), whose sum is σ = 484162560. Its totient is φ = 49420800.

The previous prime is 170121403. The next prime is 170121433. The reversal of 170121432 is 234121071.

It is a junction number, because it is equal to n+sod(n) for n = 170121399 and 170121408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170121433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1083498 + ... + 1083654.

It is an arithmetic number, because the mean of its divisors is an integer number (3782520).

Almost surely, 2^170121432 is an apocalyptic number.

170121432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 170121432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242081280).

170121432 is an abundant number, since it is smaller than the sum of its proper divisors (314041128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

170121432 is a wasteful number, since it uses less digits than its factorization.

170121432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 170121432 is about 13043.0606837506. The cubic root of 170121432 is about 554.0976946315.

The spelling of 170121432 in words is "one hundred seventy million, one hundred twenty-one thousand, four hundred thirty-two".