221206130 has 16 divisors (see below), whose sum is σ = 404699544. Its totient is φ = 87031680.

The previous prime is 221206127. The next prime is 221206169. The reversal of 221206130 is 31602122.

It is a Cunningham number, because it is equal to 14873²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 79619929 + 141586201 = 8923^2 + 11899^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221206099 and 221206108.

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, 180707 + ... + 181926.

Almost surely, 2^221206130 is an apocalyptic number.

221206130 is a deficient number, since it is larger than the sum of its proper divisors (183493414).

221206130 is a wasteful number, since it uses less digits than its factorization.

221206130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362701.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 221206130 is about 14873.0000336180. Note that the first 4 decimals coincide. The cubic root of 221206130 is about 604.7822725860.

Adding to 221206130 its reverse (31602122), we get a palindrome (252808252).

The spelling of 221206130 in words is "two hundred twenty-one million, two hundred six thousand, one hundred thirty".