1221020303 has 8 divisors (see below), whose sum is σ = 1279891536. Its totient is φ = 1163534400.

The previous prime is 1221020279. The next prime is 1221020327. The reversal of 1221020303 is 3030201221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221020279) and next prime (1221020327).

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 1221020303 - 2¹⁸ = 1220758159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221220303) 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, 344528 + ... + 348053.

It is an arithmetic number, because the mean of its divisors is an integer number (159986442).

Almost surely, 2^1221020303 is an apocalyptic number.

1221020303 is a deficient number, since it is larger than the sum of its proper divisors (58871233).

1221020303 is an equidigital number, since it uses as much as digits as its factorization.

1221020303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692665.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1221020303 is about 34943.1009356640. The cubic root of 1221020303 is about 1068.8275225825.

Adding to 1221020303 its reverse (3030201221), we get a palindrome (4251221524).

The spelling of 1221020303 in words is "one billion, two hundred twenty-one million, twenty thousand, three hundred three".