21530602235355 has 16 divisors (see below), whose sum is σ = 34478584381440. Its totient is φ = 11473114257248.

The previous prime is 21530602235353. The next prime is 21530602235369. The reversal of 21530602235355 is 55353220603512.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21530602235355 - 2¹ = 21530602235353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21530602235353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 617082075 + ... + 617116964.

It is an arithmetic number, because the mean of its divisors is an integer number (2154911523840).

Almost surely, 2^{21530602235355} is an apocalyptic number.

21530602235355 is a deficient number, since it is larger than the sum of its proper divisors (12947982146085).

21530602235355 is a wasteful number, since it uses less digits than its factorization.

21530602235355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234200210.

The product of its (nonzero) digits is 810000, while the sum is 42.

Adding to 21530602235355 its reverse (55353220603512), we get a palindrome (76883822838867).

The spelling of 21530602235355 in words is "twenty-one trillion, five hundred thirty billion, six hundred two million, two hundred thirty-five thousand, three hundred fifty-five".