1206601221 has 16 divisors (see below), whose sum is σ = 1844440704. Its totient is φ = 687307584.

The previous prime is 1206601211. The next prime is 1206601223. The reversal of 1206601221 is 1221066021.

It is a de Polignac number, because none of the positive numbers 2^k-1206601221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206601223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83970 + ... + 97283.

It is an arithmetic number, because the mean of its divisors is an integer number (115277544).

Almost surely, 2^1206601221 is an apocalyptic number.

It is an amenable number.

1206601221 is a deficient number, since it is larger than the sum of its proper divisors (637839483).

1206601221 is a wasteful number, since it uses less digits than its factorization.

1206601221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181580.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1206601221 is about 34736.1658937771. The cubic root of 1206601221 is about 1064.6035748224.

Adding to 1206601221 its reverse (1221066021), we get a palindrome (2427667242).

The spelling of 1206601221 in words is "one billion, two hundred six million, six hundred one thousand, two hundred twenty-one".