42170331 has 12 divisors (see below), whose sum is σ = 65407272. Its totient is φ = 24097248.

The previous prime is 42170311. The next prime is 42170383. The reversal of 42170331 is 13307124.

It is not a de Polignac number, because 42170331 - 2⁵ = 42170299 is a prime.

It is a super-2 number, since 2×42170331² = 3556673633299122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 42170298 and 42170307.

It is not an unprimeable number, because it can be changed into a prime (42170311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143290 + ... + 143583.

It is an arithmetic number, because the mean of its divisors is an integer number (5450606).

Almost surely, 2^42170331 is an apocalyptic number.

42170331 is a deficient number, since it is larger than the sum of its proper divisors (23236941).

42170331 is a wasteful number, since it uses less digits than its factorization.

42170331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286890 (or 286883 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 42170331 is about 6493.8687236500. The cubic root of 42170331 is about 348.0719315569.

Adding to 42170331 its reverse (13307124), we get a palindrome (55477455).

The spelling of 42170331 in words is "forty-two million, one hundred seventy thousand, three hundred thirty-one".