170444370421 has 4 divisors (see below), whose sum is σ = 183555475852. Its totient is φ = 157333264992.

The previous prime is 170444370389. The next prime is 170444370431. The reversal of 170444370421 is 124073444071.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57259225521 + 113185144900 = 239289^2 + 336430^2 .

It is a cyclic number.

It is not a de Polignac number, because 170444370421 - 2⁵ = 170444370389 is a prime.

It is a super-2 number, since 2×170444370421² (a number of 23 digits) 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 (170444370431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6555552696 + ... + 6555552721.

It is an arithmetic number, because the mean of its divisors is an integer number (45888868963).

Almost surely, 2^170444370421 is an apocalyptic number.

It is an amenable number.

170444370421 is a deficient number, since it is larger than the sum of its proper divisors (13111105431).

170444370421 is a wasteful number, since it uses less digits than its factorization.

170444370421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13111105430.

The product of its (nonzero) digits is 75264, while the sum is 37.

The spelling of 170444370421 in words is "one hundred seventy billion, four hundred forty-four million, three hundred seventy thousand, four hundred twenty-one".