21225153 has 8 divisors (see below), whose sum is σ = 28902528. Its totient is φ = 13848944.

The previous prime is 21225121. The next prime is 21225179. The reversal of 21225153 is 35152212.

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 21225153 - 2⁵ = 21225121 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21225103) by changing a digit.

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, 75126 + ... + 75407.

It is an arithmetic number, because the mean of its divisors is an integer number (3612816).

Almost surely, 2^21225153 is an apocalyptic number.

It is an amenable number.

21225153 is a deficient number, since it is larger than the sum of its proper divisors (7677375).

21225153 is a wasteful number, since it uses less digits than its factorization.

21225153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150583.

The product of its digits is 600, while the sum is 21.

The square root of 21225153 is about 4607.0764048364. The cubic root of 21225153 is about 276.8749147426.

Adding to 21225153 its reverse (35152212), we get a palindrome (56377365).

The spelling of 21225153 in words is "twenty-one million, two hundred twenty-five thousand, one hundred fifty-three".