21098133 has 12 divisors (see below), whose sum is σ = 34828768. Its totient is φ = 12056040.

The previous prime is 21098111. The next prime is 21098141. The reversal of 21098133 is 33189012.

It is not a de Polignac number, because 21098133 - 2⁶ = 21098069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21098097 and 21098106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21098183) 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 11 ways as a sum of consecutive naturals, for example, 167383 + ... + 167508.

Almost surely, 2^21098133 is an apocalyptic number.

It is an amenable number.

21098133 is a deficient number, since it is larger than the sum of its proper divisors (13730635).

21098133 is a wasteful number, since it uses less digits than its factorization.

21098133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334904 (or 334901 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21098133 is about 4593.2704035360. The cubic root of 21098133 is about 276.3214983883.

The spelling of 21098133 in words is "twenty-one million, ninety-eight thousand, one hundred thirty-three".