21235427530 has 16 divisors (see below), whose sum is σ = 38233395144. Its totient is φ = 8492032000.

The previous prime is 21235427527. The next prime is 21235427531. The reversal of 21235427530 is 3572453212.

It can be written as a sum of positive squares in 4 ways, for example, as 13291092369 + 7944335161 = 115287^2 + 89131^2 .

It is not an unprimeable number, because it can be changed into a prime (21235427531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225367 + ... + 305386.

Almost surely, 2^21235427530 is an apocalyptic number.

21235427530 is a deficient number, since it is larger than the sum of its proper divisors (16997967614).

21235427530 is a wasteful number, since it uses less digits than its factorization.

21235427530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534761.

The product of its (nonzero) digits is 50400, while the sum is 34.

The spelling of 21235427530 in words is "twenty-one billion, two hundred thirty-five million, four hundred twenty-seven thousand, five hundred thirty".