15105421 has 2 divisors, whose sum is σ = 15105422. Its totient is φ = 15105420.

The previous prime is 15105413. The next prime is 15105439. The reversal of 15105421 is 12450151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14364100 + 741321 = 3790^2 + 861^2 .

It is a cyclic number.

It is not a de Polignac number, because 15105421 - 2³ = 15105413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15105721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7552710 + 7552711.

It is an arithmetic number, because the mean of its divisors is an integer number (7552711).

Almost surely, 2^15105421 is an apocalyptic number.

It is an amenable number.

15105421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15105421 is an equidigital number, since it uses as much as digits as its factorization.

15105421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 15105421 is about 3886.5693098155. The cubic root of 15105421 is about 247.1976159512.

Adding to 15105421 its reverse (12450151), we get a palindrome (27555572).

The spelling of 15105421 in words is "fifteen million, one hundred five thousand, four hundred twenty-one".