1221049300 has 72 divisors (see below), whose sum is σ = 2782696896. Its totient is φ = 464175360.

The previous prime is 1221049243. The next prime is 1221049303. The reversal of 1221049300 is 39401221.

It is a super-2 number, since 2×1221049300² = 2981922786060980000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221049303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 373272 + ... + 376528.

It is an arithmetic number, because the mean of its divisors is an integer number (38648568).

Almost surely, 2^1221049300 is an apocalyptic number.

1221049300 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 1221049300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1391348448).

1221049300 is an abundant number, since it is smaller than the sum of its proper divisors (1561647596).

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

1221049300 is a wasteful number, since it uses less digits than its factorization.

1221049300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3457 (or 3450 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1221049300 is about 34943.5158505838. The cubic root of 1221049300 is about 1068.8359834155.

The spelling of 1221049300 in words is "one billion, two hundred twenty-one million, forty-nine thousand, three hundred".