1343440021 has 32 divisors (see below), whose sum is σ = 1700794368. Its totient is φ = 1030803840.

The previous prime is 1343440019. The next prime is 1343440081. The reversal of 1343440021 is 1200443431.

It is not a de Polignac number, because 1343440021 - 2¹ = 1343440019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1343439974 and 1343440001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1343440081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1847560 + ... + 1848286.

It is an arithmetic number, because the mean of its divisors is an integer number (53149824).

Almost surely, 2^1343440021 is an apocalyptic number.

1343440021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1343440021 is a deficient number, since it is larger than the sum of its proper divisors (357354347).

1343440021 is a wasteful number, since it uses less digits than its factorization.

1343440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1343440021 is about 36652.9674242073. The cubic root of 1343440021 is about 1103.4163814435.

Adding to 1343440021 its reverse (1200443431), we get a palindrome (2543883452).

The spelling of 1343440021 in words is "one billion, three hundred forty-three million, four hundred forty thousand, twenty-one".