1221363360 has 240 divisors, whose sum is σ = 4926531456. Its totient is φ = 279148032.

The previous prime is 1221363359. The next prime is 1221363379. The reversal of 1221363360 is 633631221.

It is a happy number.

1221363360 is a `hidden beast` number, since 1 + 2 + 21 + 3 + 633 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 83989 + ... + 97451.

Almost surely, 2^1221363360 is an apocalyptic number.

1221363360 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 1221363360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2463265728).

1221363360 is an abundant number, since it is smaller than the sum of its proper divisors (3705168096).

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

1221363360 is a wasteful number, since it uses less digits than its factorization.

1221363360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13497 (or 13480 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 1221363360 is about 34948.0093853713. The cubic root of 1221363360 is about 1068.9276122175.

Adding to 1221363360 its reverse (633631221), we get a palindrome (1854994581).

The spelling of 1221363360 in words is "one billion, two hundred twenty-one million, three hundred sixty-three thousand, three hundred sixty".