1356203221 has 4 divisors (see below), whose sum is σ = 1399951744. Its totient is φ = 1312454700.

The previous prime is 1356203201. The next prime is 1356203239. The reversal of 1356203221 is 1223026531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1223026531 = 16927 ⋅72253.

It is a cyclic number.

It is not a de Polignac number, because 1356203221 - 2⁹ = 1356202709 is a prime.

It is a super-3 number, since 3×1356203221³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356203201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21874215 + ... + 21874276.

It is an arithmetic number, because the mean of its divisors is an integer number (349987936).

Almost surely, 2^1356203221 is an apocalyptic number.

It is an amenable number.

1356203221 is a deficient number, since it is larger than the sum of its proper divisors (43748523).

1356203221 is an equidigital number, since it uses as much as digits as its factorization.

1356203221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43748522.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1356203221 is about 36826.6645380762. The cubic root of 1356203221 is about 1106.8996679503.

Adding to 1356203221 its reverse (1223026531), we get a palindrome (2579229752).

The spelling of 1356203221 in words is "one billion, three hundred fifty-six million, two hundred three thousand, two hundred twenty-one".