42121071 has 12 divisors (see below), whose sum is σ = 62136672. Its totient is φ = 27482976.

The previous prime is 42121067. The next prime is 42121097. The reversal of 42121071 is 17012124.

It is not a de Polignac number, because 42121071 - 2² = 42121067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42122071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49366 + ... + 50211.

It is an arithmetic number, because the mean of its divisors is an integer number (5178056).

Almost surely, 2^42121071 is an apocalyptic number.

42121071 is a deficient number, since it is larger than the sum of its proper divisors (20015601).

42121071 is a wasteful number, since it uses less digits than its factorization.

42121071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99630 (or 99627 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 42121071 is about 6490.0748069649. The cubic root of 42121071 is about 347.9363488421.

Adding to 42121071 its reverse (17012124), we get a palindrome (59133195).

The spelling of 42121071 in words is "forty-two million, one hundred twenty-one thousand, seventy-one".