1221000300 has 216 divisors, whose sum is σ = 4176885440. Its totient is φ = 296524800.

The previous prime is 1221000283. The next prime is 1221000323. The reversal of 1221000300 is 30001221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 923640 + ... + 924960.

Almost surely, 2^1221000300 is an apocalyptic number.

1221000300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221000300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2088442720).

1221000300 is an abundant number, since it is smaller than the sum of its proper divisors (2955885140).

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

1221000300 is a wasteful number, since it uses less digits than its factorization.

1221000300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1423 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1221000300 is about 34942.8147120406. The cubic root of 1221000300 is about 1068.8216859682.

Adding to 1221000300 its reverse (30001221), we get a palindrome (1251001521).

The spelling of 1221000300 in words is "one billion, two hundred twenty-one million, three hundred", and thus it is an aban number.