1221303300 has 72 divisors (see below), whose sum is σ = 4038449856. Its totient is φ = 279154560.

The previous prime is 1221303287. The next prime is 1221303313. The reversal of 1221303300 is 33031221.

It is an interprime number because it is at equal distance from previous prime (1221303287) and next prime (1221303313).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1221303300.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288687 + ... + 292886.

Almost surely, 2^1221303300 is an apocalyptic number.

1221303300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221303300 is an abundant number, since it is smaller than the sum of its proper divisors (2817146556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221303300 is a wasteful number, since it uses less digits than its factorization.

1221303300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581597 (or 581590 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 1221303300 is about 34947.1500983986. The cubic root of 1221303300 is about 1068.9100905836.

Adding to 1221303300 its reverse (33031221), we get a palindrome (1254334521).

The spelling of 1221303300 in words is "one billion, two hundred twenty-one million, three hundred three thousand, three hundred".