15241421 has 4 divisors (see below), whose sum is σ = 16413852. Its totient is φ = 14068992.

The previous prime is 15241417. The next prime is 15241423. The reversal of 15241421 is 12414251.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12414251 = 47 ⋅264133.

It can be written as a sum of positive squares in 2 ways, for example, as 8916196 + 6325225 = 2986^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 15241421 - 2² = 15241417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15241393 and 15241402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15241423) 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 in 3 ways as a sum of consecutive naturals, for example, 586196 + ... + 586221.

It is an arithmetic number, because the mean of its divisors is an integer number (4103463).

Almost surely, 2^15241421 is an apocalyptic number.

It is an amenable number.

15241421 is a deficient number, since it is larger than the sum of its proper divisors (1172431).

15241421 is a wasteful number, since it uses less digits than its factorization.

15241421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172430.

The product of its digits is 320, while the sum is 20.

The square root of 15241421 is about 3904.0262550347. The cubic root of 15241421 is about 247.9372727672.

Adding to 15241421 its reverse (12414251), we get a palindrome (27655672).

The spelling of 15241421 in words is "fifteen million, two hundred forty-one thousand, four hundred twenty-one".