42124821 has 8 divisors (see below), whose sum is σ = 57472800. Its totient is φ = 27430032.

The previous prime is 42124813. The next prime is 42124829. The reversal of 42124821 is 12842124.

It is an interprime number because it is at equal distance from previous prime (42124813) and next prime (42124829).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42124821 - 2³ = 42124813 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42124791 and 42124800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42124829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163146 + ... + 163403.

It is an arithmetic number, because the mean of its divisors is an integer number (7184100).

Almost surely, 2^42124821 is an apocalyptic number.

It is an amenable number.

42124821 is a deficient number, since it is larger than the sum of its proper divisors (15347979).

42124821 is a wasteful number, since it uses less digits than its factorization.

42124821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326595.

The product of its digits is 1024, while the sum is 24.

The square root of 42124821 is about 6490.3637032142. The cubic root of 42124821 is about 347.9466740195.

Adding to 42124821 its reverse (12842124), we get a palindrome (54966945).

The spelling of 42124821 in words is "forty-two million, one hundred twenty-four thousand, eight hundred twenty-one".