1230221605 has 16 divisors (see below), whose sum is σ = 1513545264. Its totient is φ = 959365120.

The previous prime is 1230221599. The next prime is 1230221627. The reversal of 1230221605 is 5061220321.

It can be written as a sum of positive squares in 8 ways, for example, as 64272289 + 1165949316 = 8017^2 + 34146^2 .

It is not a de Polignac number, because 1230221605 - 2¹⁵ = 1230188837 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 390597 + ... + 393733.

It is an arithmetic number, because the mean of its divisors is an integer number (94596579).

Almost surely, 2^1230221605 is an apocalyptic number.

It is an amenable number.

1230221605 is a deficient number, since it is larger than the sum of its proper divisors (283323659).

1230221605 is a wasteful number, since it uses less digits than its factorization.

1230221605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5096.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1230221605 is about 35074.5150358490. The cubic root of 1230221605 is about 1071.5056118275.

Adding to 1230221605 its reverse (5061220321), we get a palindrome (6291441926).

The spelling of 1230221605 in words is "one billion, two hundred thirty million, two hundred twenty-one thousand, six hundred five".