21034553 has 8 divisors (see below), whose sum is σ = 21280896. Its totient is φ = 20790000.

The previous prime is 21034543. The next prime is 21034561. The reversal of 21034553 is 35543012.

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 21034553 - 2⁸ = 21034297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034513) 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, 45200 + ... + 45662.

It is an arithmetic number, because the mean of its divisors is an integer number (2660112).

Almost surely, 2^21034553 is an apocalyptic number.

It is an amenable number.

21034553 is a deficient number, since it is larger than the sum of its proper divisors (246343).

21034553 is a wasteful number, since it uses less digits than its factorization.

21034553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21034553 is about 4586.3441868224. The cubic root of 21034553 is about 276.0436507660.

Adding to 21034553 its reverse (35543012), we get a palindrome (56577565).

The spelling of 21034553 in words is "twenty-one million, thirty-four thousand, five hundred fifty-three".