21098241 has 24 divisors (see below), whose sum is σ = 32727240. Its totient is φ = 13049856.

The previous prime is 21098221. The next prime is 21098257. The reversal of 21098241 is 14289012.

It can be written as a sum of positive squares in 4 ways, for example, as 6051600 + 15046641 = 2460^2 + 3879^2 .

It is not a de Polignac number, because 21098241 - 2¹⁰ = 21097217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21098201) 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 23 ways as a sum of consecutive naturals, for example, 10225 + ... + 12113.

It is an arithmetic number, because the mean of its divisors is an integer number (1363635).

Almost surely, 2^21098241 is an apocalyptic number.

It is an amenable number.

21098241 is a deficient number, since it is larger than the sum of its proper divisors (11628999).

21098241 is a wasteful number, since it uses less digits than its factorization.

21098241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985 (or 1982 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21098241 is about 4593.2821598504. The cubic root of 21098241 is about 276.3219698782.

The spelling of 21098241 in words is "twenty-one million, ninety-eight thousand, two hundred forty-one".