1221011300 has 18 divisors (see below), whose sum is σ = 2649594738. Its totient is φ = 488404480.

The previous prime is 1221011293. The next prime is 1221011303. The reversal of 1221011300 is 31101221.

It can be written as a sum of positive squares in 3 ways, for example, as 487204 + 1220524096 = 698^2 + 34936^2 .

It is not an unprimeable number, because it can be changed into a prime (1221011303) 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, 6104957 + ... + 6105156.

Almost surely, 2^1221011300 is an apocalyptic number.

1221011300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221011300 is an abundant number, since it is smaller than the sum of its proper divisors (1428583438).

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

1221011300 is a wasteful number, since it uses less digits than its factorization.

1221011300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12210127 (or 12210120 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1221011300 is about 34942.9721117137. The cubic root of 1221011300 is about 1068.8248956325.

Adding to 1221011300 its reverse (31101221), we get a palindrome (1252112521).

The spelling of 1221011300 in words is "one billion, two hundred twenty-one million, eleven thousand, three hundred".