1355221011 has 32 divisors (see below), whose sum is σ = 2027592000. Its totient is φ = 800952320.

The previous prime is 1355221003. The next prime is 1355221027. The reversal of 1355221011 is 1101225531.

It is a cyclic number.

It is not a de Polignac number, because 1355221011 - 2³ = 1355221003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1355221001) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 49465 + ... + 71813.

It is an arithmetic number, because the mean of its divisors is an integer number (63362250).

Almost surely, 2^1355221011 is an apocalyptic number.

1355221011 is a deficient number, since it is larger than the sum of its proper divisors (672370989).

1355221011 is a wasteful number, since it uses less digits than its factorization.

1355221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22439.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1355221011 is about 36813.3265408058. The cubic root of 1355221011 is about 1106.6323848774.

Adding to 1355221011 its reverse (1101225531), we get a palindrome (2456446542).

The spelling of 1355221011 in words is "one billion, three hundred fifty-five million, two hundred twenty-one thousand, eleven".