42121868 has 6 divisors (see below), whose sum is σ = 73713276. Its totient is φ = 21060932.

The previous prime is 42121847. The next prime is 42121889. The reversal of 42121868 is 86812124.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (42121847) and next prime (42121889).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5265230 + ... + 5265237.

It is an arithmetic number, because the mean of its divisors is an integer number (12285546).

Almost surely, 2^42121868 is an apocalyptic number.

It is an amenable number.

42121868 is a deficient number, since it is larger than the sum of its proper divisors (31591408).

42121868 is a wasteful number, since it uses less digits than its factorization.

42121868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10530471 (or 10530469 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 42121868 is about 6490.1362081238. The cubic root of 42121868 is about 347.9385433378.

The spelling of 42121868 in words is "forty-two million, one hundred twenty-one thousand, eight hundred sixty-eight".