42121035755 has 4 divisors (see below), whose sum is σ = 50545242912. Its totient is φ = 33696828600.

The previous prime is 42121035751. The next prime is 42121035769. The reversal of 42121035755 is 55753012124.

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

It is not a de Polignac number, because 42121035755 - 2² = 42121035751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42121035751) 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, 4212103571 + ... + 4212103580.

It is an arithmetic number, because the mean of its divisors is an integer number (12636310728).

Almost surely, 2^42121035755 is an apocalyptic number.

42121035755 is a deficient number, since it is larger than the sum of its proper divisors (8424207157).

42121035755 is an equidigital number, since it uses as much as digits as its factorization.

42121035755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8424207156.

The product of its (nonzero) digits is 42000, while the sum is 35.

Adding to 42121035755 its reverse (55753012124), we get a palindrome (97874047879).

The spelling of 42121035755 in words is "forty-two billion, one hundred twenty-one million, thirty-five thousand, seven hundred fifty-five".