42121051345 has 4 divisors (see below), whose sum is σ = 50545261620. Its totient is φ = 33696841072.

The previous prime is 42121051339. The next prime is 42121051373. The reversal of 42121051345 is 54315012124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8693511121 + 33427540224 = 93239^2 + 182832^2 .

It is a cyclic number.

It is not a de Polignac number, because 42121051345 - 2¹¹ = 42121049297 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4212105130 + ... + 4212105139.

It is an arithmetic number, because the mean of its divisors is an integer number (12636315405).

Almost surely, 2^42121051345 is an apocalyptic number.

It is an amenable number.

42121051345 is a deficient number, since it is larger than the sum of its proper divisors (8424210275).

42121051345 is an equidigital number, since it uses as much as digits as its factorization.

42121051345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8424210274.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 42121051345 its reverse (54315012124), we get a palindrome (96436063469).

The spelling of 42121051345 in words is "forty-two billion, one hundred twenty-one million, fifty-one thousand, three hundred forty-five".