21385482530 has 16 divisors (see below), whose sum is σ = 38615306040. Its totient is φ = 8527206912.

The previous prime is 21385482511. The next prime is 21385482539. The reversal of 21385482530 is 3528458312.

It can be written as a sum of positive squares in 4 ways, for example, as 8596812961 + 12788669569 = 92719^2 + 113087^2 .

It is not an unprimeable number, because it can be changed into a prime (21385482539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3369935 + ... + 3376274.

Almost surely, 2^21385482530 is an apocalyptic number.

21385482530 is a deficient number, since it is larger than the sum of its proper divisors (17229823510).

21385482530 is a wasteful number, since it uses less digits than its factorization.

21385482530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6746533.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 21385482530 in words is "twenty-one billion, three hundred eighty-five million, four hundred eighty-two thousand, five hundred thirty".