21530602235242 has 16 divisors (see below), whose sum is σ = 32303368544832. Its totient is φ = 10762812998080.

The previous prime is 21530602235221. The next prime is 21530602235267. The reversal of 21530602235242 is 24253220603512.

It is a super-2 number, since 2×21530602235242² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181341117 + ... + 181459807.

It is an arithmetic number, because the mean of its divisors is an integer number (2018960534052).

Almost surely, 2^{21530602235242} is an apocalyptic number.

21530602235242 is a deficient number, since it is larger than the sum of its proper divisors (10772766309590).

21530602235242 is a wasteful number, since it uses less digits than its factorization.

21530602235242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138893.

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 21530602235242 its reverse (24253220603512), we get a palindrome (45783822838754).

The spelling of 21530602235242 in words is "twenty-one trillion, five hundred thirty billion, six hundred two million, two hundred thirty-five thousand, two hundred forty-two".