1221303219 has 4 divisors (see below), whose sum is σ = 1628404296. Its totient is φ = 814202144.

The previous prime is 1221303191. The next prime is 1221303227. The reversal of 1221303219 is 9123031221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9123031221 = 3 ⋅3041010407.

It is a cyclic number.

It is not a de Polignac number, because 1221303219 - 2⁹ = 1221302707 is a prime.

It is a super-2 number, since 2×1221303219² = 2983163105479523922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221303119) 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 3 ways as a sum of consecutive naturals, for example, 203550534 + ... + 203550539.

It is an arithmetic number, because the mean of its divisors is an integer number (407101074).

Almost surely, 2^1221303219 is an apocalyptic number.

1221303219 is a deficient number, since it is larger than the sum of its proper divisors (407101077).

1221303219 is an equidigital number, since it uses as much as digits as its factorization.

1221303219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407101076.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 1221303219 is about 34947.1489395058. The cubic root of 1221303219 is about 1068.9100669527.

The spelling of 1221303219 in words is "one billion, two hundred twenty-one million, three hundred three thousand, two hundred nineteen".