21115153 has 8 divisors (see below), whose sum is σ = 21412160. Its totient is φ = 20820240.

The previous prime is 21115141. The next prime is 21115189. The reversal of 21115153 is 35151112.

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 21115153 - 2¹³ = 21106961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21115153.

It is not an unprimeable number, because it can be changed into a prime (21115453) 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, 33148 + ... + 33778.

It is an arithmetic number, because the mean of its divisors is an integer number (2676520).

Almost surely, 2^21115153 is an apocalyptic number.

It is an amenable number.

21115153 is a deficient number, since it is larger than the sum of its proper divisors (297007).

21115153 is a wasteful number, since it uses less digits than its factorization.

21115153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047.

The product of its digits is 150, while the sum is 19.

The square root of 21115153 is about 4595.1227404717. The cubic root of 21115153 is about 276.3957818620.

Adding to 21115153 its reverse (35151112), we get a palindrome (56266265).

The spelling of 21115153 in words is "twenty-one million, one hundred fifteen thousand, one hundred fifty-three".