1221002303 has 8 divisors (see below), whose sum is σ = 1237692240. Its totient is φ = 1204378560.

The previous prime is 1221002269. The next prime is 1221002327. The reversal of 1221002303 is 3032001221.

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 1221002303 - 2²⁰ = 1219953727 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 (1221002903) 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, 21176 + ... + 53762.

It is an arithmetic number, because the mean of its divisors is an integer number (154711530).

Almost surely, 2^1221002303 is an apocalyptic number.

1221002303 is a deficient number, since it is larger than the sum of its proper divisors (16689937).

1221002303 is an equidigital number, since it uses as much as digits as its factorization.

1221002303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33097.

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

The square root of 1221002303 is about 34942.8433731429. The cubic root of 1221002303 is about 1068.8222704204.

Adding to 1221002303 its reverse (3032001221), we get a palindrome (4253003524).

The spelling of 1221002303 in words is "one billion, two hundred twenty-one million, two thousand, three hundred three".