1221303299 has 4 divisors (see below), whose sum is σ = 1285582440. Its totient is φ = 1157024160.

The previous prime is 1221303287. The next prime is 1221303313. The reversal of 1221303299 is 9923031221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9923031221 = 37 ⋅268190033.

It is a cyclic number.

It is not a de Polignac number, because 1221303299 - 2²⁰ = 1220254723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221303799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32139542 + ... + 32139579.

It is an arithmetic number, because the mean of its divisors is an integer number (321395610).

Almost surely, 2^1221303299 is an apocalyptic number.

1221303299 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1221303299 is a deficient number, since it is larger than the sum of its proper divisors (64279141).

1221303299 is an equidigital number, since it uses as much as digits as its factorization.

1221303299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64279140.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 1221303299 is about 34947.1500840913. The cubic root of 1221303299 is about 1068.9100902919.

The spelling of 1221303299 in words is "one billion, two hundred twenty-one million, three hundred three thousand, two hundred ninety-nine".