42350021 has 16 divisors (see below), whose sum is σ = 49638528. Its totient is φ = 35380800.

The previous prime is 42350017. The next prime is 42350029. The reversal of 42350021 is 12005324.

It is not a de Polignac number, because 42350021 - 2² = 42350017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42350029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78011 + ... + 78551.

It is an arithmetic number, because the mean of its divisors is an integer number (3102408).

Almost surely, 2^42350021 is an apocalyptic number.

It is an amenable number.

42350021 is a deficient number, since it is larger than the sum of its proper divisors (7288507).

42350021 is a wasteful number, since it uses less digits than its factorization.

42350021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 42350021 is about 6507.6893748857. The cubic root of 42350021 is about 348.5656152890.

Adding to 42350021 its reverse (12005324), we get a palindrome (54355345).

The spelling of 42350021 in words is "forty-two million, three hundred fifty thousand, twenty-one".