1343021 has 4 divisors (see below), whose sum is σ = 1345344. Its totient is φ = 1340700.

The previous prime is 1343009. The next prime is 1343029. The reversal of 1343021 is 1203431.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1203431 = 911 ⋅1321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1343021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1342987 and 1343005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1343029) 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, 476 + ... + 1706.

It is an arithmetic number, because the mean of its divisors is an integer number (336336).

2^1343021 is an apocalyptic number.

It is an amenable number.

1343021 is a deficient number, since it is larger than the sum of its proper divisors (2323).

1343021 is a wasteful number, since it uses less digits than its factorization.

1343021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1343021 is about 1158.8878289118. The cubic root of 1343021 is about 110.3301650428.

Adding to 1343021 its reverse (1203431), we get a palindrome (2546452).

It can be divided in two parts, 13 and 43021, that added together give a palindrome (43034).

The spelling of 1343021 in words is "one million, three hundred forty-three thousand, twenty-one".