1355266221 has 16 divisors (see below), whose sum is σ = 1818883584. Its totient is φ = 897597504.

The previous prime is 1355266207. The next prime is 1355266259. The reversal of 1355266221 is 1226625531.

1355266221 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1355266221 - 2¹¹ = 1355264173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355266261) 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, 370815 + ... + 374451.

It is an arithmetic number, because the mean of its divisors is an integer number (113680224).

Almost surely, 2^1355266221 is an apocalyptic number.

It is an amenable number.

1355266221 is a deficient number, since it is larger than the sum of its proper divisors (463617363).

1355266221 is a wasteful number, since it uses less digits than its factorization.

1355266221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4420.

The product of its digits is 21600, while the sum is 33.

The square root of 1355266221 is about 36813.9405796228. The cubic root of 1355266221 is about 1106.6446904456.

The spelling of 1355266221 in words is "one billion, three hundred fifty-five million, two hundred sixty-six thousand, two hundred twenty-one".