21353043 has 8 divisors (see below), whose sum is σ = 28536768. Its totient is φ = 14202344.

The previous prime is 21353029. The next prime is 21353047. The reversal of 21353043 is 34035312.

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 21353043 - 2⁹ = 21352531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21353047) 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, 6705 + ... + 9362.

It is an arithmetic number, because the mean of its divisors is an integer number (3567096).

Almost surely, 2^21353043 is an apocalyptic number.

21353043 is a deficient number, since it is larger than the sum of its proper divisors (7183725).

21353043 is a wasteful number, since it uses less digits than its factorization.

21353043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16513.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 21353043 is about 4620.9352949376. The cubic root of 21353043 is about 277.4298954474.

Adding to 21353043 its reverse (34035312), we get a palindrome (55388355).

The spelling of 21353043 in words is "twenty-one million, three hundred fifty-three thousand, forty-three".