21120042041 has 8 divisors (see below), whose sum is σ = 24145528704. Its totient is φ = 18096639840.

The previous prime is 21120042023. The next prime is 21120042061. The reversal of 21120042041 is 14024002112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21120042041 - 2²² = 21115847737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120042001) 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 7 ways as a sum of consecutive naturals, for example, 499340 + ... + 539981.

It is an arithmetic number, because the mean of its divisors is an integer number (3018191088).

Almost surely, 2^21120042041 is an apocalyptic number.

It is an amenable number.

21120042041 is a deficient number, since it is larger than the sum of its proper divisors (3025486663).

21120042041 is a wasteful number, since it uses less digits than its factorization.

21120042041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042231.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21120042041 its reverse (14024002112), we get a palindrome (35144044153).

The spelling of 21120042041 in words is "twenty-one billion, one hundred twenty million, forty-two thousand, forty-one".