1340024021 has 12 divisors (see below), whose sum is σ = 1570710240. Its totient is φ = 1139818680.

The previous prime is 1340024017. The next prime is 1340024029. The reversal of 1340024021 is 1204200431.

It is not a de Polignac number, because 1340024021 - 2² = 1340024017 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 (1340024029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97961 + ... + 110798.

It is an arithmetic number, because the mean of its divisors is an integer number (130892520).

Almost surely, 2^1340024021 is an apocalyptic number.

It is an amenable number.

1340024021 is a deficient number, since it is larger than the sum of its proper divisors (230686219).

1340024021 is a wasteful number, since it uses less digits than its factorization.

1340024021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208904 (or 208897 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1340024021 is about 36606.3385358328. The cubic root of 1340024021 is about 1102.4803591025.

Adding to 1340024021 its reverse (1204200431), we get a palindrome (2544224452).

The spelling of 1340024021 in words is "one billion, three hundred forty million, twenty-four thousand, twenty-one".