21325521434 has 16 divisors (see below), whose sum is σ = 36690021888. Its totient is φ = 9106512912.

The previous prime is 21325521421. The next prime is 21325521439. The reversal of 21325521434 is 43412552312.

It is a self number, because there is not a number n which added to its sum of digits gives 21325521434.

It is not an unprimeable number, because it can be changed into a prime (21325521439) 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, 2745674 + ... + 2753429.

It is an arithmetic number, because the mean of its divisors is an integer number (2293126368).

Almost surely, 2^21325521434 is an apocalyptic number.

21325521434 is a deficient number, since it is larger than the sum of its proper divisors (15364500454).

21325521434 is a wasteful number, since it uses less digits than its factorization.

21325521434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5499389.

The product of its digits is 28800, while the sum is 32.

The spelling of 21325521434 in words is "twenty-one billion, three hundred twenty-five million, five hundred twenty-one thousand, four hundred thirty-four".