1221302221 has 8 divisors (see below), whose sum is σ = 1226615040. Its totient is φ = 1216001568.

The previous prime is 1221302213. The next prime is 1221302227. The reversal of 1221302221 is 1222031221.

It is a happy number.

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 1221302221 - 2³ = 1221302213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221302195 and 1221302204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221302227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237540 + ... + 242626.

It is an arithmetic number, because the mean of its divisors is an integer number (153326880).

Almost surely, 2^1221302221 is an apocalyptic number.

It is an amenable number.

1221302221 is a deficient number, since it is larger than the sum of its proper divisors (5312819).

1221302221 is an equidigital number, since it uses as much as digits as its factorization.

1221302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6083.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1221302221 is about 34947.1346607987. The cubic root of 1221302221 is about 1068.9097757958.

Adding to 1221302221 its reverse (1222031221), we get a palindrome (2443333442).

Subtracting 1221302221 from its reverse (1222031221), we obtain a cube (729000 = 90³).

The spelling of 1221302221 in words is "one billion, two hundred twenty-one million, three hundred two thousand, two hundred twenty-one".