1221227260 has 48 divisors (see below), whose sum is σ = 2812465152. Its totient is φ = 441742400.

The previous prime is 1221227243. The next prime is 1221227269. The reversal of 1221227260 is 627221221.

1221227260 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221227269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27489 + ... + 56551.

It is an arithmetic number, because the mean of its divisors is an integer number (58593024).

Almost surely, 2^1221227260 is an apocalyptic number.

1221227260 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 1221227260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1406232576).

1221227260 is an abundant number, since it is smaller than the sum of its proper divisors (1591237892).

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

1221227260 is a wasteful number, since it uses less digits than its factorization.

1221227260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29274 (or 29272 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1221227260 is about 34946.0621529808. The cubic root of 1221227260 is about 1068.8879061925.

Adding to 1221227260 its reverse (627221221), we get a palindrome (1848448481).

The spelling of 1221227260 in words is "one billion, two hundred twenty-one million, two hundred twenty-seven thousand, two hundred sixty".