21115099 has 8 divisors (see below), whose sum is σ = 22268880. Its totient is φ = 19965600.

The previous prime is 21115093. The next prime is 21115141. The reversal of 21115099 is 99051112.

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 21115099 - 2³ = 21115091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21115091) 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, 17289 + ... + 18469.

It is an arithmetic number, because the mean of its divisors is an integer number (2783610).

Almost surely, 2^21115099 is an apocalyptic number.

21115099 is a deficient number, since it is larger than the sum of its proper divisors (1153781).

21115099 is a wasteful number, since it uses less digits than its factorization.

21115099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141.

The product of its (nonzero) digits is 810, while the sum is 28.

The square root of 21115099 is about 4595.1168646728. The cubic root of 21115099 is about 276.3955462432.

The spelling of 21115099 in words is "twenty-one million, one hundred fifteen thousand, ninety-nine".