21284153 has 8 divisors (see below), whose sum is σ = 24585120. Its totient is φ = 18210880.

The previous prime is 21284149. The next prime is 21284171. The reversal of 21284153 is 35148212.

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 21284153 - 2² = 21284149 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21280153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56723 + ... + 57096.

It is an arithmetic number, because the mean of its divisors is an integer number (3073140).

Almost surely, 2^21284153 is an apocalyptic number.

It is an amenable number.

21284153 is a deficient number, since it is larger than the sum of its proper divisors (3300967).

21284153 is a wasteful number, since it uses less digits than its factorization.

21284153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113847.

The product of its digits is 1920, while the sum is 26.

The square root of 21284153 is about 4613.4751543712. The cubic root of 21284153 is about 277.1312223909.

The spelling of 21284153 in words is "twenty-one million, two hundred eighty-four thousand, one hundred fifty-three".