1221236250 has 240 divisors, whose sum is σ = 3457593216. Its totient is φ = 287040000.

The previous prime is 1221236239. The next prime is 1221236251. The reversal of 1221236250 is 526321221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221236250.

It is not an unprimeable number, because it can be changed into a prime (1221236251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 25983727 + ... + 25983773.

Almost surely, 2^1221236250 is an apocalyptic number.

1221236250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221236250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1728796608).

1221236250 is an abundant number, since it is smaller than the sum of its proper divisors (2236356966).

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

1221236250 is a wasteful number, since it uses less digits than its factorization.

1221236250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1221236250 is about 34946.1907795399. The cubic root of 1221236250 is about 1068.8905290400.

Adding to 1221236250 its reverse (526321221), we get a palindrome (1747557471).

The spelling of 1221236250 in words is "one billion, two hundred twenty-one million, two hundred thirty-six thousand, two hundred fifty".