42124121 has 16 divisors (see below), whose sum is σ = 48048000. Its totient is φ = 36609408.

The previous prime is 42124111. The next prime is 42124123. The reversal of 42124121 is 12142124.

It is a cyclic number.

It is not a de Polignac number, because 42124121 - 2⁶ = 42124057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42124121.

It is not an unprimeable number, because it can be changed into a prime (42124123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48725 + ... + 49581.

It is an arithmetic number, because the mean of its divisors is an integer number (3003000).

Almost surely, 2^42124121 is an apocalyptic number.

It is an amenable number.

42124121 is a deficient number, since it is larger than the sum of its proper divisors (5923879).

42124121 is a wasteful number, since it uses less digits than its factorization.

42124121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088.

The product of its digits is 128, while the sum is 17.

The square root of 42124121 is about 6490.3097768905. The cubic root of 42124121 is about 347.9447466996.

Adding to 42124121 its reverse (12142124), we get a palindrome (54266245).

It can be divided in two parts, 421 and 24121, that added together give a palindrome (24542).

The spelling of 42124121 in words is "forty-two million, one hundred twenty-four thousand, one hundred twenty-one".