42417021 has 16 divisors (see below), whose sum is σ = 59345408. Its totient is φ = 26913600.

The previous prime is 42417017. The next prime is 42417041. The reversal of 42417021 is 12071424.

It is a happy number.

It is not a de Polignac number, because 42417021 - 2² = 42417017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42417041) 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, 1935 + ... + 9411.

It is an arithmetic number, because the mean of its divisors is an integer number (3709088).

Almost surely, 2^42417021 is an apocalyptic number.

It is an amenable number.

42417021 is a deficient number, since it is larger than the sum of its proper divisors (16928387).

42417021 is a wasteful number, since it uses less digits than its factorization.

42417021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7572.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 42417021 is about 6512.8350969451. The cubic root of 42417021 is about 348.7493349251.

Adding to 42417021 its reverse (12071424), we get a palindrome (54488445).

The spelling of 42417021 in words is "forty-two million, four hundred seventeen thousand, twenty-one".