1355243421 has 64 divisors (see below), whose sum is σ = 2218291200. Its totient is φ = 734247360.

The previous prime is 1355243401. The next prime is 1355243429. The reversal of 1355243421 is 1243425531.

It is not a de Polignac number, because 1355243421 - 2⁷ = 1355243293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355243429) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4094226 + ... + 4094556.

It is an arithmetic number, because the mean of its divisors is an integer number (34660800).

Almost surely, 2^1355243421 is an apocalyptic number.

It is an amenable number.

1355243421 is a deficient number, since it is larger than the sum of its proper divisors (863047779).

1355243421 is a wasteful number, since it uses less digits than its factorization.

1355243421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 537 counting only the distinct ones).

The product of its digits is 14400, while the sum is 30.

The square root of 1355243421 is about 36813.6309130192. The cubic root of 1355243421 is about 1106.6384846193.

Adding to 1355243421 its reverse (1243425531), we get a palindrome (2598668952).

The spelling of 1355243421 in words is "one billion, three hundred fifty-five million, two hundred forty-three thousand, four hundred twenty-one".