42163121 has 32 divisors (see below), whose sum is σ = 57485568. Its totient is φ = 29859840.

The previous prime is 42163097. The next prime is 42163123. The reversal of 42163121 is 12136124.

42163121 = T₁₂₃ + T₁₂₄ + ... + T₆₃₃.

42163121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42163121 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 42163093 and 42163102.

It is not an unprimeable number, because it can be changed into a prime (42163123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72785 + ... + 73361.

It is an arithmetic number, because the mean of its divisors is an integer number (1796424).

Almost surely, 2^42163121 is an apocalyptic number.

It is an amenable number.

42163121 is a deficient number, since it is larger than the sum of its proper divisors (15322447).

42163121 is a wasteful number, since it uses less digits than its factorization.

42163121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681.

The product of its digits is 288, while the sum is 20.

The square root of 42163121 is about 6493.3135608871. The cubic root of 42163121 is about 348.0520934258.

Adding to 42163121 its reverse (12136124), we get a palindrome (54299245).

It can be divided in two parts, 4216 and 3121, that added together give a palindrome (7337).

The spelling of 42163121 in words is "forty-two million, one hundred sixty-three thousand, one hundred twenty-one".