21105530530 has 32 divisors (see below), whose sum is σ = 43555849344. Its totient is φ = 7213055616.

The previous prime is 21105530507. The next prime is 21105530557. The reversal of 21105530530 is 3503550112.

It is a junction number, because it is equal to n+sod(n) for n = 21105530495 and 21105530504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459732 + ... + 503551.

It is an arithmetic number, because the mean of its divisors is an integer number (1361120292).

Almost surely, 2^21105530530 is an apocalyptic number.

21105530530 is an abundant number, since it is smaller than the sum of its proper divisors (22450318814).

21105530530 is a wasteful number, since it uses less digits than its factorization.

21105530530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963610.

The product of its (nonzero) digits is 2250, while the sum is 25.

The spelling of 21105530530 in words is "twenty-one billion, one hundred five million, five hundred thirty thousand, five hundred thirty".