423475021 has 12 divisors (see below), whose sum is σ = 449474844. Its totient is φ = 398908800.

The previous prime is 423475007. The next prime is 423475043. The reversal of 423475021 is 120574324.

It can be written as a sum of positive squares in 2 ways, for example, as 186622921 + 236852100 = 13661^2 + 15390^2 .

It is not a de Polignac number, because 423475021 - 2¹⁹ = 422950733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423475421) 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, 62101 + ... + 68581.

It is an arithmetic number, because the mean of its divisors is an integer number (37456237).

Almost surely, 2^423475021 is an apocalyptic number.

It is an amenable number.

423475021 is a deficient number, since it is larger than the sum of its proper divisors (25999823).

423475021 is a wasteful number, since it uses less digits than its factorization.

423475021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700 (or 6681 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 423475021 is about 20578.5087166199. The cubic root of 423475021 is about 750.9469644339.

The spelling of 423475021 in words is "four hundred twenty-three million, four hundred seventy-five thousand, twenty-one".