21452043 has 4 divisors (see below), whose sum is σ = 28602728. Its totient is φ = 14301360.

The previous prime is 21452029. The next prime is 21452051. The reversal of 21452043 is 34025412.

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

It is not a de Polignac number, because 21452043 - 2⁴ = 21452027 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 (21452063) 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, 3575338 + ... + 3575343.

It is an arithmetic number, because the mean of its divisors is an integer number (7150682).

Almost surely, 2^21452043 is an apocalyptic number.

21452043 is a deficient number, since it is larger than the sum of its proper divisors (7150685).

21452043 is an equidigital number, since it uses as much as digits as its factorization.

21452043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7150684.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21452043 is about 4631.6350244811. The cubic root of 21452043 is about 277.8579877818.

Adding to 21452043 its reverse (34025412), we get a palindrome (55477455).

The spelling of 21452043 in words is "twenty-one million, four hundred fifty-two thousand, forty-three".