15340421 has 2 divisors, whose sum is σ = 15340422. Its totient is φ = 15340420.

The previous prime is 15340417. The next prime is 15340469. The reversal of 15340421 is 12404351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15319396 + 21025 = 3914^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 15340421 - 2² = 15340417 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15340393 and 15340402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15340411) 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 as a sum of consecutive naturals, namely, 7670210 + 7670211.

It is an arithmetic number, because the mean of its divisors is an integer number (7670211).

Almost surely, 2^15340421 is an apocalyptic number.

It is an amenable number.

15340421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15340421 is an equidigital number, since it uses as much as digits as its factorization.

15340421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 15340421 is about 3916.6849503119. The cubic root of 15340421 is about 248.4729366352.

Adding to 15340421 its reverse (12404351), we get a palindrome (27744772).

The spelling of 15340421 in words is "fifteen million, three hundred forty thousand, four hundred twenty-one".