21052135513530 has 96 divisors (see below), whose sum is σ = 60430927677120. Its totient is φ = 5042059453440.

The previous prime is 21052135513523. The next prime is 21052135513547. The reversal of 21052135513530 is 3531553125012.

21052135513530 is a `hidden beast` number, since 2 + 1 + 0 + 5 + 2 + 135 + 513 + 5 + 3 + 0 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 128018935 + ... + 128183274.

It is an arithmetic number, because the mean of its divisors is an integer number (629488829970).

Almost surely, 2^{21052135513530} is an apocalyptic number.

21052135513530 is an abundant number, since it is smaller than the sum of its proper divisors (39378792163590).

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

21052135513530 is a wasteful number, since it uses less digits than its factorization.

21052135513530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256202316 (or 256202313 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 36.

Adding to 21052135513530 its reverse (3531553125012), we get a palindrome (24583688638542).

The spelling of 21052135513530 in words is "twenty-one trillion, fifty-two billion, one hundred thirty-five million, five hundred thirteen thousand, five hundred thirty".