21126455526 has 48 divisors (see below), whose sum is σ = 49175268912. Its totient is φ = 6025367040.

The previous prime is 21126455501. The next prime is 21126455533. The reversal of 21126455526 is 62555462112.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 843535 + ... + 868218.

It is an arithmetic number, because the mean of its divisors is an integer number (1024484769).

Almost surely, 2^21126455526 is an apocalyptic number.

21126455526 is an abundant number, since it is smaller than the sum of its proper divisors (28048813386).

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

21126455526 is a wasteful number, since it uses less digits than its factorization.

21126455526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1711797 (or 1711786 counting only the distinct ones).

The product of its digits is 144000, while the sum is 39.

The spelling of 21126455526 in words is "twenty-one billion, one hundred twenty-six million, four hundred fifty-five thousand, five hundred twenty-six".