1221341140 has 48 divisors (see below), whose sum is σ = 2650177152. Its totient is φ = 472438656.

The previous prime is 1221341137. The next prime is 1221341159. The reversal of 1221341140 is 411431221.

1221341140 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 an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118639 + ... + 128521.

It is an arithmetic number, because the mean of its divisors is an integer number (55212024).

Almost surely, 2^1221341140 is an apocalyptic number.

1221341140 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 1221341140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1325088576).

1221341140 is an abundant number, since it is smaller than the sum of its proper divisors (1428836012).

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

1221341140 is a wasteful number, since it uses less digits than its factorization.

1221341140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10096 (or 10094 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1221341140 is about 34947.6914831295. The cubic root of 1221341140 is about 1068.9211299217.

Adding to 1221341140 its reverse (411431221), we get a palindrome (1632772361).

The spelling of 1221341140 in words is "one billion, two hundred twenty-one million, three hundred forty-one thousand, one hundred forty".