42243121457 has 4 divisors (see below), whose sum is σ = 42630673140. Its totient is φ = 41855569776.

The previous prime is 42243121423. The next prime is 42243121463. The reversal of 42243121457 is 75412134224.

42243121457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 14602063921 + 27641057536 = 120839^2 + 166256^2 .

It is a cyclic number.

It is not a de Polignac number, because 42243121457 - 2¹⁸ = 42242859313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42243121157) 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, 193775678 + ... + 193775895.

It is an arithmetic number, because the mean of its divisors is an integer number (10657668285).

Almost surely, 2^42243121457 is an apocalyptic number.

It is an amenable number.

42243121457 is a deficient number, since it is larger than the sum of its proper divisors (387551683).

42243121457 is a wasteful number, since it uses less digits than its factorization.

42243121457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387551682.

The product of its digits is 53760, while the sum is 35.

The spelling of 42243121457 in words is "forty-two billion, two hundred forty-three million, one hundred twenty-one thousand, four hundred fifty-seven".