42121505 has 8 divisors (see below), whose sum is σ = 50601024. Its totient is φ = 33660400.

The previous prime is 42121501. The next prime is 42121549. The reversal of 42121505 is 50512124.

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

It is not a de Polignac number, because 42121505 - 2² = 42121501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42121501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1070 + ... + 9240.

It is an arithmetic number, because the mean of its divisors is an integer number (6325128).

Almost surely, 2^42121505 is an apocalyptic number.

It is an amenable number.

42121505 is a deficient number, since it is larger than the sum of its proper divisors (8479519).

42121505 is a wasteful number, since it uses less digits than its factorization.

42121505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9207.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 42121505 is about 6490.1082425488. The cubic root of 42121505 is about 347.9375438407.

Adding to 42121505 its reverse (50512124), we get a palindrome (92633629).

The spelling of 42121505 in words is "forty-two million, one hundred twenty-one thousand, five hundred five".