42121771067 has 4 divisors (see below), whose sum is σ = 42134196096. Its totient is φ = 42109346040.

The previous prime is 42121771039. The next prime is 42121771151. The reversal of 42121771067 is 76017712124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42121771067 - 2⁸ = 42121770811 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42121771067.

It is not an unprimeable number, because it can be changed into a prime (42121779067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6207428 + ... + 6214209.

It is an arithmetic number, because the mean of its divisors is an integer number (10533549024).

Almost surely, 2^42121771067 is an apocalyptic number.

42121771067 is a deficient number, since it is larger than the sum of its proper divisors (12425029).

42121771067 is a wasteful number, since it uses less digits than its factorization.

42121771067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12425028.

The product of its (nonzero) digits is 32928, while the sum is 38.

The spelling of 42121771067 in words is "forty-two billion, one hundred twenty-one million, seven hundred seventy-one thousand, sixty-seven".