42121513 has 8 divisors (see below), whose sum is σ = 48589632. Its totient is φ = 35766096.

The previous prime is 42121501. The next prime is 42121549. The reversal of 42121513 is 31512124.

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 42121513 - 2⁵ = 42121481 is a prime.

It is a super-3 number, since 3×42121513³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (42121913) 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 7 ways as a sum of consecutive naturals, for example, 27370 + ... + 28867.

It is an arithmetic number, because the mean of its divisors is an integer number (6073704).

Almost surely, 2^42121513 is an apocalyptic number.

It is an amenable number.

42121513 is a deficient number, since it is larger than the sum of its proper divisors (6468119).

42121513 is a wasteful number, since it uses less digits than its factorization.

42121513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56351.

The product of its digits is 240, while the sum is 19.

The square root of 42121513 is about 6490.1088588713. The cubic root of 42121513 is about 347.9375658682.

Adding to 42121513 its reverse (31512124), we get a palindrome (73633637).

The spelling of 42121513 in words is "forty-two million, one hundred twenty-one thousand, five hundred thirteen".