42465453721 has 4 divisors (see below), whose sum is σ = 42478321444. Its totient is φ = 42452586000.

The previous prime is 42465453707. The next prime is 42465453743. The reversal of 42465453721 is 12735456424.

42465453721 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 16629392025 + 25836061696 = 128955^2 + 160736^2 .

It is a cyclic number.

It is not a de Polignac number, because 42465453721 - 2⁵ = 42465453689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42465453761) 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, 6428910 + ... + 6435511.

It is an arithmetic number, because the mean of its divisors is an integer number (10619580361).

Almost surely, 2^42465453721 is an apocalyptic number.

It is an amenable number.

42465453721 is a deficient number, since it is larger than the sum of its proper divisors (12867723).

42465453721 is a wasteful number, since it uses less digits than its factorization.

42465453721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12867722.

The product of its digits is 806400, while the sum is 43.

The spelling of 42465453721 in words is "forty-two billion, four hundred sixty-five million, four hundred fifty-three thousand, seven hundred twenty-one".