15417421 has 2 divisors, whose sum is σ = 15417422. Its totient is φ = 15417420.

The previous prime is 15417401. The next prime is 15417427. The reversal of 15417421 is 12471451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14356521 + 1060900 = 3789^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 15417421 - 2⁷ = 15417293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15417427) 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, 7708710 + 7708711.

It is an arithmetic number, because the mean of its divisors is an integer number (7708711).

Almost surely, 2^15417421 is an apocalyptic number.

It is an amenable number.

15417421 is a deficient number, since it is larger than the sum of its proper divisors (1).

15417421 is an equidigital number, since it uses as much as digits as its factorization.

15417421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 25.

The square root of 15417421 is about 3926.5023876218. The cubic root of 15417421 is about 248.8879729171.

Adding to 15417421 its reverse (12471451), we get a palindrome (27888872).

The spelling of 15417421 in words is "fifteen million, four hundred seventeen thousand, four hundred twenty-one".