2221521530 has 16 divisors (see below), whose sum is σ = 3999365280. Its totient is φ = 888469392.

The previous prime is 2221521527. The next prime is 2221521587. The reversal of 2221521530 is 351251222.

2221521530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2221521496 and 2221521505.

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, 70997 + ... + 97383.

It is an arithmetic number, because the mean of its divisors is an integer number (249960330).

Almost surely, 2^2221521530 is an apocalyptic number.

2221521530 is a deficient number, since it is larger than the sum of its proper divisors (1777843750).

2221521530 is a wasteful number, since it uses less digits than its factorization.

2221521530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34813.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2221521530 is about 47133.0195298370. The cubic root of 2221521530 is about 1304.8187101061.

Adding to 2221521530 its reverse (351251222), we get a palindrome (2572772752).

The spelling of 2221521530 in words is "two billion, two hundred twenty-one million, five hundred twenty-one thousand, five hundred thirty".