1355221056 has 224 divisors, whose sum is σ = 4378716160. Its totient is φ = 361304064.

The previous prime is 1355221031. The next prime is 1355221057. The reversal of 1355221056 is 6501225531.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×1355221056² = 3673248221251510272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1355221057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1863765 + ... + 1864491.

It is an arithmetic number, because the mean of its divisors is an integer number (19547840).

Almost surely, 2^1355221056 is an apocalyptic number.

1355221056 is a gapful number since it is divisible by the number (16) 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 1355221056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2189358080).

1355221056 is an abundant number, since it is smaller than the sum of its proper divisors (3023495104).

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

1355221056 is a wasteful number, since it uses less digits than its factorization.

1355221056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1355221056 is about 36813.3271519975. The cubic root of 1355221056 is about 1106.6323971259.

Adding to 1355221056 its reverse (6501225531), we get a palindrome (7856446587).

The spelling of 1355221056 in words is "one billion, three hundred fifty-five million, two hundred twenty-one thousand, fifty-six".