1355423221 has 4 divisors (see below), whose sum is σ = 1358140000. Its totient is φ = 1352706444.

The previous prime is 1355423207. The next prime is 1355423227. The reversal of 1355423221 is 1223245531.

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: 1223245531 = 397 ⋅3081223.

It is a cyclic number.

It is not a de Polignac number, because 1355423221 - 2⁷ = 1355423093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1355423221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355423227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1357641 + ... + 1358638.

It is an arithmetic number, because the mean of its divisors is an integer number (339535000).

Almost surely, 2^1355423221 is an apocalyptic number.

It is an amenable number.

1355423221 is a deficient number, since it is larger than the sum of its proper divisors (2716779).

1355423221 is an equidigital number, since it uses as much as digits as its factorization.

1355423221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716778.

The product of its digits is 7200, while the sum is 28.

The square root of 1355423221 is about 36816.0728622704. The cubic root of 1355423221 is about 1106.6874216584.

Adding to 1355423221 its reverse (1223245531), we get a palindrome (2578668752).

The spelling of 1355423221 in words is "one billion, three hundred fifty-five million, four hundred twenty-three thousand, two hundred twenty-one".