1533213221 has 8 divisors (see below), whose sum is σ = 1675770624. Its totient is φ = 1396474560.

The previous prime is 1533213217. The next prime is 1533213247. The reversal of 1533213221 is 1223123351.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1533213221 - 2² = 1533213217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1533213271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1454135 + ... + 1455188.

It is an arithmetic number, because the mean of its divisors is an integer number (209471328).

Almost surely, 2^1533213221 is an apocalyptic number.

It is an amenable number.

1533213221 is a deficient number, since it is larger than the sum of its proper divisors (142557403).

1533213221 is a wasteful number, since it uses less digits than its factorization.

1533213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909371.

The product of its digits is 1080, while the sum is 23.

The square root of 1533213221 is about 39156.2666887435. The cubic root of 1533213221 is about 1153.1014506943.

Adding to 1533213221 its reverse (1223123351), we get a palindrome (2756336572).

The spelling of 1533213221 in words is "one billion, five hundred thirty-three million, two hundred thirteen thousand, two hundred twenty-one".