1221213303 has 6 divisors (see below), whose sum is σ = 1763974784. Its totient is φ = 814142196.

The previous prime is 1221213293. The next prime is 1221213311. The reversal of 1221213303 is 3033121221.

It is not a de Polignac number, because 1221213303 - 2¹² = 1221209207 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 (1221212303) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67845175 + ... + 67845192.

Almost surely, 2^1221213303 is an apocalyptic number.

1221213303 is a deficient number, since it is larger than the sum of its proper divisors (542761481).

1221213303 is a wasteful number, since it uses less digits than its factorization.

1221213303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135690373 (or 135690370 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1221213303 is about 34945.8624589521. The cubic root of 1221213303 is about 1068.8838341889.

Adding to 1221213303 its reverse (3033121221), we get a palindrome (4254334524).

The spelling of 1221213303 in words is "one billion, two hundred twenty-one million, two hundred thirteen thousand, three hundred three".