42921173 has 2 divisors, whose sum is σ = 42921174. Its totient is φ = 42921172.

The previous prime is 42921169. The next prime is 42921191. The reversal of 42921173 is 37112924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31618129 + 11303044 = 5623^2 + 3362^2 .

It is a cyclic number.

It is not a de Polignac number, because 42921173 - 2² = 42921169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42921973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21460586 + 21460587.

It is an arithmetic number, because the mean of its divisors is an integer number (21460587).

Almost surely, 2^42921173 is an apocalyptic number.

It is an amenable number.

42921173 is a deficient number, since it is larger than the sum of its proper divisors (1).

42921173 is an equidigital number, since it uses as much as digits as its factorization.

42921173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 42921173 is about 6551.4252647802. The cubic root of 42921173 is about 350.1255957415.

The spelling of 42921173 in words is "forty-two million, nine hundred twenty-one thousand, one hundred seventy-three".