21453043 has 8 divisors (see below), whose sum is σ = 22434048. Its totient is φ = 20476104.

The previous prime is 21453037. The next prime is 21453059. The reversal of 21453043 is 34035412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21453043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21453143) 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, 16080 + ... + 17362.

It is an arithmetic number, because the mean of its divisors is an integer number (2804256).

Almost surely, 2^21453043 is an apocalyptic number.

21453043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21453043 is a deficient number, since it is larger than the sum of its proper divisors (981005).

21453043 is a wasteful number, since it uses less digits than its factorization.

21453043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21453043 is about 4631.7429764615. The cubic root of 21453043 is about 277.8623052210.

Adding to 21453043 its reverse (34035412), we get a palindrome (55488455).

The spelling of 21453043 in words is "twenty-one million, four hundred fifty-three thousand, forty-three".