1343210021 has 4 divisors (see below), whose sum is σ = 1362128544. Its totient is φ = 1324291500.

The previous prime is 1343210017. The next prime is 1343210027. The reversal of 1343210021 is 1200123431.

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.

It is a cyclic number.

It is not a de Polignac number, because 1343210021 - 2² = 1343210017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1343210027) 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, 9459155 + ... + 9459296.

It is an arithmetic number, because the mean of its divisors is an integer number (340532136).

Almost surely, 2^1343210021 is an apocalyptic number.

It is an amenable number.

1343210021 is a deficient number, since it is larger than the sum of its proper divisors (18918523).

1343210021 is an equidigital number, since it uses as much as digits as its factorization.

1343210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18918522.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1343210021 is about 36649.8297540384. The cubic root of 1343210021 is about 1103.3534087148.

Adding to 1343210021 its reverse (1200123431), we get a palindrome (2543333452).

The spelling of 1343210021 in words is "one billion, three hundred forty-three million, two hundred ten thousand, twenty-one".