21050042500424 has 16 divisors (see below), whose sum is σ = 45107233929600. Its totient is φ = 9021446785872.

The previous prime is 21050042500411. The next prime is 21050042500439. The reversal of 21050042500424 is 42400524005012.

It is an unprimeable number.

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, 187946807984 + ... + 187946808095.

It is an arithmetic number, because the mean of its divisors is an integer number (2819202120600).

Almost surely, 2^{21050042500424} is an apocalyptic number.

It is an amenable number.

21050042500424 is an abundant number, since it is smaller than the sum of its proper divisors (24057191429176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21050042500424 is a wasteful number, since it uses less digits than its factorization.

21050042500424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375893616092 (or 375893616088 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 21050042500424 its reverse (42400524005012), we get a palindrome (63450566505436).

The spelling of 21050042500424 in words is "twenty-one trillion, fifty billion, forty-two million, five hundred thousand, four hundred twenty-four".