1340210421 has 32 divisors (see below), whose sum is σ = 2173530240. Its totient is φ = 809424000.

The previous prime is 1340210407. The next prime is 1340210423. The reversal of 1340210421 is 1240120431.

1340210421 is a `hidden beast` number, since 1 + 34 + 0 + 210 + 421 = 666.

It is not a de Polignac number, because 1340210421 - 2⁶ = 1340210357 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1340210394 and 1340210403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340210423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79321 + ... + 94721.

It is an arithmetic number, because the mean of its divisors is an integer number (67922820).

Almost surely, 2^1340210421 is an apocalyptic number.

1340210421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1340210421 is a deficient number, since it is larger than the sum of its proper divisors (833319819).

1340210421 is a wasteful number, since it uses less digits than its factorization.

1340210421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15714 (or 15708 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1340210421 is about 36608.8844544600. The cubic root of 1340210421 is about 1102.5314758009.

Adding to 1340210421 its reverse (1240120431), we get a palindrome (2580330852).

The spelling of 1340210421 in words is "one billion, three hundred forty million, two hundred ten thousand, four hundred twenty-one".