21461043 has 4 divisors (see below), whose sum is σ = 28614728. Its totient is φ = 14307360.

The previous prime is 21461039. The next prime is 21461053. The reversal of 21461043 is 34016412.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21461043 - 2² = 21461039 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21461023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576838 + ... + 3576843.

It is an arithmetic number, because the mean of its divisors is an integer number (7153682).

Almost surely, 2^21461043 is an apocalyptic number.

21461043 is a deficient number, since it is larger than the sum of its proper divisors (7153685).

21461043 is an equidigital number, since it uses as much as digits as its factorization.

21461043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7153684.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21461043 is about 4632.6065017439. The cubic root of 21461043 is about 277.8968399050.

Adding to 21461043 its reverse (34016412), we get a palindrome (55477455).

The spelling of 21461043 in words is "twenty-one million, four hundred sixty-one thousand, forty-three".