21452143 has 8 divisors (see below), whose sum is σ = 22097376. Its totient is φ = 20812800.

The previous prime is 21452131. The next prime is 21452149. The reversal of 21452143 is 34125412.

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

It is a cyclic number.

It is not a de Polignac number, because 21452143 - 2⁵ = 21452111 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21452149) 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, 6558 + ... + 9268.

It is an arithmetic number, because the mean of its divisors is an integer number (2762172).

Almost surely, 2^21452143 is an apocalyptic number.

21452143 is a deficient number, since it is larger than the sum of its proper divisors (645233).

21452143 is a wasteful number, since it uses less digits than its factorization.

21452143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2945.

The product of its digits is 960, while the sum is 22.

The square root of 21452143 is about 4631.6458197924. The cubic root of 21452143 is about 277.8584195318.

Adding to 21452143 its reverse (34125412), we get a palindrome (55577555).

The spelling of 21452143 in words is "twenty-one million, four hundred fifty-two thousand, one hundred forty-three".