15421441 has 4 divisors (see below), whose sum is σ = 17624512. Its totient is φ = 13218372.

The previous prime is 15421423. The next prime is 15421447. The reversal of 15421441 is 14412451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14412451 = 449 ⋅32099.

It is a cyclic number.

It is not a de Polignac number, because 15421441 - 2⁵ = 15421409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15421447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1101525 + ... + 1101538.

It is an arithmetic number, because the mean of its divisors is an integer number (4406128).

It is a Proth number, since it is equal to 3765 ⋅ 2¹² + 1 and 3765 < 2¹².

Almost surely, 2^15421441 is an apocalyptic number.

It is an amenable number.

15421441 is a deficient number, since it is larger than the sum of its proper divisors (2203071).

15421441 is an equidigital number, since it uses as much as digits as its factorization.

15421441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203070.

The product of its digits is 640, while the sum is 22.

The square root of 15421441 is about 3927.0142602237. The cubic root of 15421441 is about 248.9096030524.

Adding to 15421441 its reverse (14412451), we get a palindrome (29833892).

The spelling of 15421441 in words is "fifteen million, four hundred twenty-one thousand, four hundred forty-one".