21115530216522 has 64 divisors (see below), whose sum is σ = 53627463106560. Its totient is φ = 6032927667312.

The previous prime is 21115530216479. The next prime is 21115530216523. The reversal of 21115530216522 is 22561203551112.

21115530216522 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 553 + 0 + 21 + 65 + 22 = 666.

It is not an unprimeable number, because it can be changed into a prime (21115530216523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31382443 + ... + 32048225.

It is an arithmetic number, because the mean of its divisors is an integer number (837929111040).

Almost surely, 2^{21115530216522} is an apocalyptic number.

21115530216522 is an abundant number, since it is smaller than the sum of its proper divisors (32511932890038).

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

21115530216522 is a wasteful number, since it uses less digits than its factorization.

21115530216522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749704 (or 749698 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 21115530216522 its reverse (22561203551112), we get a palindrome (43676733767634).

The spelling of 21115530216522 in words is "twenty-one trillion, one hundred fifteen billion, five hundred thirty million, two hundred sixteen thousand, five hundred twenty-two".