42145410521 has 4 divisors (see below), whose sum is σ = 42467131344. Its totient is φ = 41823689700.

The previous prime is 42145410479. The next prime is 42145410523. The reversal of 42145410521 is 12501454124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42145410521 - 2⁶ = 42145410457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42145410523) 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, 160860215 + ... + 160860476.

It is an arithmetic number, because the mean of its divisors is an integer number (10616782836).

Almost surely, 2^42145410521 is an apocalyptic number.

It is an amenable number.

42145410521 is a deficient number, since it is larger than the sum of its proper divisors (321720823).

42145410521 is a wasteful number, since it uses less digits than its factorization.

42145410521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321720822.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 42145410521 its reverse (12501454124), we get a palindrome (54646864645).

The spelling of 42145410521 in words is "forty-two billion, one hundred forty-five million, four hundred ten thousand, five hundred twenty-one".