42820419921 has 4 divisors (see below), whose sum is σ = 57093893232. Its totient is φ = 28546946612.

The previous prime is 42820419907. The next prime is 42820419949. The reversal of 42820419921 is 12991402824.

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 42820419921 - 2⁹ = 42820419409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42820419991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7136736651 + ... + 7136736656.

It is an arithmetic number, because the mean of its divisors is an integer number (14273473308).

Almost surely, 2^42820419921 is an apocalyptic number.

It is an amenable number.

42820419921 is a deficient number, since it is larger than the sum of its proper divisors (14273473311).

42820419921 is a wasteful number, since it uses less digits than its factorization.

42820419921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14273473310.

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 42820419921 in words is "forty-two billion, eight hundred twenty million, four hundred nineteen thousand, nine hundred twenty-one".