42121345 has 8 divisors (see below), whose sum is σ = 57766464. Its totient is φ = 28883184.

The previous prime is 42121333. The next prime is 42121351. The reversal of 42121345 is 54312124.

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

It is a cyclic number.

It is not a de Polignac number, because 42121345 - 2⁷ = 42121217 is a prime.

It is a super-5 number, since 5×42121345⁵ (a number of 39 digits) contains 55555 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 601699 + ... + 601768.

It is an arithmetic number, because the mean of its divisors is an integer number (7220808).

Almost surely, 2^42121345 is an apocalyptic number.

It is an amenable number.

42121345 is a deficient number, since it is larger than the sum of its proper divisors (15645119).

42121345 is a wasteful number, since it uses less digits than its factorization.

42121345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203479.

The product of its digits is 960, while the sum is 22.

The square root of 42121345 is about 6490.0959160863. The cubic root of 42121345 is about 347.9371032892.

Adding to 42121345 its reverse (54312124), we get a palindrome (96433469).

The spelling of 42121345 in words is "forty-two million, one hundred twenty-one thousand, three hundred forty-five".