21424772526 has 16 divisors (see below), whose sum is σ = 42852457728. Its totient is φ = 7141105400.

The previous prime is 21424772513. The next prime is 21424772531. The reversal of 21424772526 is 62527742412.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 19110 + ... + 207881.

It is an arithmetic number, because the mean of its divisors is an integer number (2678278608).

Almost surely, 2^21424772526 is an apocalyptic number.

21424772526 is an abundant number, since it is smaller than the sum of its proper divisors (21427685202).

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

21424772526 is a wasteful number, since it uses less digits than its factorization.

21424772526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242727.

The product of its digits is 376320, while the sum is 42.

The spelling of 21424772526 in words is "twenty-one billion, four hundred twenty-four million, seven hundred seventy-two thousand, five hundred twenty-six".