1343445021 has 20 divisors (see below), whose sum is σ = 2007872064. Its totient is φ = 895185000.

The previous prime is 1343445017. The next prime is 1343445023. The reversal of 1343445021 is 1205443431.

It is a happy number.

It is not a de Polignac number, because 1343445021 - 2² = 1343445017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1343445023) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 280396 + ... + 285146.

Almost surely, 2^1343445021 is an apocalyptic number.

It is an amenable number.

1343445021 is a deficient number, since it is larger than the sum of its proper divisors (664427043).

1343445021 is an equidigital number, since it uses as much as digits as its factorization.

1343445021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8254 (or 8245 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 1343445021 is about 36653.0356314453. The cubic root of 1343445021 is about 1103.4177503361.

Adding to 1343445021 its reverse (1205443431), we get a palindrome (2548888452).

The spelling of 1343445021 in words is "one billion, three hundred forty-three million, four hundred forty-five thousand, twenty-one".