21330453 has 8 divisors (see below), whose sum is σ = 29677248. Its totient is φ = 13601984.

The previous prime is 21330443. The next prime is 21330467. The reversal of 21330453 is 35403312.

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 21330453 - 2¹⁸ = 21068309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330403) 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, 154500 + ... + 154637.

It is an arithmetic number, because the mean of its divisors is an integer number (3709656).

Almost surely, 2^21330453 is an apocalyptic number.

21330453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21330453 is a deficient number, since it is larger than the sum of its proper divisors (8346795).

21330453 is a wasteful number, since it uses less digits than its factorization.

21330453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309163.

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

The square root of 21330453 is about 4618.4903377619. The cubic root of 21330453 is about 277.3320272310.

Adding to 21330453 its reverse (35403312), we get a palindrome (56733765).

The spelling of 21330453 in words is "twenty-one million, three hundred thirty thousand, four hundred fifty-three".