1221440201 has 8 divisors (see below), whose sum is σ = 1245603744. Its totient is φ = 1197501760.

The previous prime is 1221440197. The next prime is 1221440239. The reversal of 1221440201 is 1020441221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221440201 - 2² = 1221440197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221440201.

It is not an unprimeable number, because it can be changed into a prime (1221445201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45296 + ... + 67041.

It is an arithmetic number, because the mean of its divisors is an integer number (155700468).

Almost surely, 2^1221440201 is an apocalyptic number.

It is an amenable number.

1221440201 is a deficient number, since it is larger than the sum of its proper divisors (24163543).

1221440201 is a wasteful number, since it uses less digits than its factorization.

1221440201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112551.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1221440201 is about 34949.1087296944. The cubic root of 1221440201 is about 1068.9500286271.

Adding to 1221440201 its reverse (1020441221), we get a palindrome (2241881422).

The spelling of 1221440201 in words is "one billion, two hundred twenty-one million, four hundred forty thousand, two hundred one".