2221206730 has 32 divisors (see below), whose sum is σ = 4130316288. Its totient is φ = 859161600.

The previous prime is 2221206709. The next prime is 2221206751. The reversal of 2221206730 is 376021222.

It is an interprime number because it is at equal distance from previous prime (2221206709) and next prime (2221206751).

It is a super-3 number, since 3×2221206730³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2221206695 and 2221206704.

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, 653335 + ... + 656725.

It is an arithmetic number, because the mean of its divisors is an integer number (129072384).

Almost surely, 2^2221206730 is an apocalyptic number.

2221206730 is a deficient number, since it is larger than the sum of its proper divisors (1909109558).

2221206730 is a wasteful number, since it uses less digits than its factorization.

2221206730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5542.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 2221206730 is about 47129.6799267723. The cubic root of 2221206730 is about 1304.7570742216.

Adding to 2221206730 its reverse (376021222), we get a palindrome (2597227952).

The spelling of 2221206730 in words is "two billion, two hundred twenty-one million, two hundred six thousand, seven hundred thirty".