170047421 has 4 divisors (see below), whose sum is σ = 172200000. Its totient is φ = 167894844.

The previous prime is 170047417. The next prime is 170047429. The reversal of 170047421 is 124740071.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 170047421 - 2² = 170047417 is a prime.

It is a super-2 number, since 2×170047421² = 57832250777502482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170047429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076171 + ... + 1076328.

It is an arithmetic number, because the mean of its divisors is an integer number (43050000).

Almost surely, 2^170047421 is an apocalyptic number.

It is an amenable number.

170047421 is a deficient number, since it is larger than the sum of its proper divisors (2152579).

170047421 is an equidigital number, since it uses as much as digits as its factorization.

170047421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152578.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 170047421 is about 13040.2231959426. The cubic root of 170047421 is about 554.0173299327.

Adding to 170047421 its reverse (124740071), we get a palindrome (294787492).

The spelling of 170047421 in words is "one hundred seventy million, forty-seven thousand, four hundred twenty-one".