1221233201 has 4 divisors (see below), whose sum is σ = 1233823332. Its totient is φ = 1208643072.

The previous prime is 1221233183. The next prime is 1221233219. The reversal of 1221233201 is 1023321221.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1221233183) and next prime (1221233219).

It can be written as a sum of positive squares in 2 ways, for example, as 284934400 + 936298801 = 16880^2 + 30599^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221233201 - 2¹⁸ = 1220971057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221233201.

It is not an unprimeable number, because it can be changed into a prime (1221233401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6294920 + ... + 6295113.

It is an arithmetic number, because the mean of its divisors is an integer number (308455833).

Almost surely, 2^1221233201 is an apocalyptic number.

It is an amenable number.

1221233201 is a deficient number, since it is larger than the sum of its proper divisors (12590131).

1221233201 is an equidigital number, since it uses as much as digits as its factorization.

1221233201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12590130.

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

The square root of 1221233201 is about 34946.1471553017. The cubic root of 1221233201 is about 1068.8896394906.

Adding to 1221233201 its reverse (1023321221), we get a palindrome (2244554422).

The spelling of 1221233201 in words is "one billion, two hundred twenty-one million, two hundred thirty-three thousand, two hundred one".