1221000303 has 16 divisors (see below), whose sum is σ = 1642582656. Its totient is φ = 806725920.

The previous prime is 1221000283. The next prime is 1221000323. The reversal of 1221000303 is 3030001221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221000283) and next prime (1221000323).

It is not a de Polignac number, because 1221000303 - 2⁵ = 1221000271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396576 + ... + 399642.

It is an arithmetic number, because the mean of its divisors is an integer number (102661416).

Almost surely, 2^1221000303 is an apocalyptic number.

1221000303 is a deficient number, since it is larger than the sum of its proper divisors (421582353).

1221000303 is a wasteful number, since it uses less digits than its factorization.

1221000303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 1221000303 is about 34942.8147549679. The cubic root of 1221000303 is about 1068.8216868436.

Adding to 1221000303 its reverse (3030001221), we get a palindrome (4251001524).

The spelling of 1221000303 in words is "one billion, two hundred twenty-one million, three hundred three", and thus it is an aban number.