1353521221 has 16 divisors (see below), whose sum is σ = 1538409600. Its totient is φ = 1180519488.

The previous prime is 1353521177. The next prime is 1353521231. The reversal of 1353521221 is 1221253531.

It is a cyclic number.

It is not a de Polignac number, because 1353521221 - 2¹¹ = 1353519173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1353521231) 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, 89040 + ... + 103126.

It is an arithmetic number, because the mean of its divisors is an integer number (96150600).

Almost surely, 2^1353521221 is an apocalyptic number.

It is an amenable number.

1353521221 is a deficient number, since it is larger than the sum of its proper divisors (184888379).

1353521221 is a wasteful number, since it uses less digits than its factorization.

1353521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14508.

The product of its digits is 1800, while the sum is 25.

The square root of 1353521221 is about 36790.2326847765. The cubic root of 1353521221 is about 1106.1695256514.

Adding to 1353521221 its reverse (1221253531), we get a palindrome (2574774752).

The spelling of 1353521221 in words is "one billion, three hundred fifty-three million, five hundred twenty-one thousand, two hundred twenty-one".