21034555 has 8 divisors (see below), whose sum is σ = 25272000. Its totient is φ = 16807296.

The previous prime is 21034543. The next prime is 21034561. The reversal of 21034555 is 55543012.

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 21034555 - 2⁹ = 21034043 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3171 + ... + 7219.

It is an arithmetic number, because the mean of its divisors is an integer number (3159000).

Almost surely, 2^21034555 is an apocalyptic number.

21034555 is a deficient number, since it is larger than the sum of its proper divisors (4237445).

21034555 is a wasteful number, since it uses less digits than its factorization.

21034555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5093.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 21034555 is about 4586.3444048610. The cubic root of 21034555 is about 276.0436595149.

Adding to 21034555 its reverse (55543012), we get a palindrome (76577567).

The spelling of 21034555 in words is "twenty-one million, thirty-four thousand, five hundred fifty-five".