11421543 has 8 divisors (see below), whose sum is σ = 17404288. Its totient is φ = 6526584.

The previous prime is 11421533. The next prime is 11421551. The reversal of 11421543 is 34512411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11421543 - 2⁵ = 11421511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 543883 = 11421543 / (1 + 1 + 4 + 2 + 1 + 5 + 4 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11421503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271921 + ... + 271962.

It is an arithmetic number, because the mean of its divisors is an integer number (2175536).

Almost surely, 2^11421543 is an apocalyptic number.

11421543 is a deficient number, since it is larger than the sum of its proper divisors (5982745).

11421543 is an equidigital number, since it uses as much as digits as its factorization.

11421543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543893.

The product of its digits is 480, while the sum is 21.

The square root of 11421543 is about 3379.5773404377. The cubic root of 11421543 is about 225.2033913952.

Adding to 11421543 its reverse (34512411), we get a palindrome (45933954).

The spelling of 11421543 in words is "eleven million, four hundred twenty-one thousand, five hundred forty-three".