1355646221 has 8 divisors (see below), whose sum is σ = 1373088864. Its totient is φ = 1338230160.

The previous prime is 1355646217. The next prime is 1355646223. The reversal of 1355646221 is 1226465531.

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 1355646221 - 2² = 1355646217 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 (1355646223) 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 7 ways as a sum of consecutive naturals, for example, 108710 + ... + 120536.

It is an arithmetic number, because the mean of its divisors is an integer number (171636108).

Almost surely, 2^1355646221 is an apocalyptic number.

It is an amenable number.

1355646221 is a deficient number, since it is larger than the sum of its proper divisors (17442643).

1355646221 is a wasteful number, since it uses less digits than its factorization.

1355646221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13291.

The product of its digits is 43200, while the sum is 35.

The square root of 1355646221 is about 36819.1013062514. The cubic root of 1355646221 is about 1106.7481106393.

The spelling of 1355646221 in words is "one billion, three hundred fifty-five million, six hundred forty-six thousand, two hundred twenty-one".