42121123 has 8 divisors (see below), whose sum is σ = 47019456. Its totient is φ = 37401000.

The previous prime is 42121099. The next prime is 42121147. The reversal of 42121123 is 32112124.

42121123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (42121099) and next prime (42121147).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42121123 is a prime.

It is a super-2 number, since 2×42121123² = 3548378005562258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42121097 and 42121106.

It is not an unprimeable number, because it can be changed into a prime (42121153) 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 7 ways as a sum of consecutive naturals, for example, 44053 + ... + 44998.

It is an arithmetic number, because the mean of its divisors is an integer number (5877432).

Almost surely, 2^42121123 is an apocalyptic number.

42121123 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

42121123 is a deficient number, since it is larger than the sum of its proper divisors (4898333).

42121123 is a wasteful number, since it uses less digits than its factorization.

42121123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89105.

The product of its digits is 96, while the sum is 16.

The square root of 42121123 is about 6490.0788130808. The cubic root of 42121123 is about 347.9364920221.

Adding to 42121123 its reverse (32112124), we get a palindrome (74233247).

It can be divided in two parts, 4212 and 1123, that added together give a palindrome (5335).

The spelling of 42121123 in words is "forty-two million, one hundred twenty-one thousand, one hundred twenty-three".