42821617191 has 4 divisors (see below), whose sum is σ = 57095489592. Its totient is φ = 28547744792.

The previous prime is 42821617177. The next prime is 42821617229. The reversal of 42821617191 is 19171612824.

42821617191 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 is a cyclic number.

It is not a de Polignac number, because 42821617191 - 2⁶ = 42821617127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42821617121) 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, 7136936196 + ... + 7136936201.

It is an arithmetic number, because the mean of its divisors is an integer number (14273872398).

Almost surely, 2^42821617191 is an apocalyptic number.

42821617191 is a deficient number, since it is larger than the sum of its proper divisors (14273872401).

42821617191 is a wasteful number, since it uses less digits than its factorization.

42821617191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14273872400.

The product of its digits is 48384, while the sum is 42.

The spelling of 42821617191 in words is "forty-two billion, eight hundred twenty-one million, six hundred seventeen thousand, one hundred ninety-one".