21098269 has 2 divisors, whose sum is σ = 21098270. Its totient is φ = 21098268.

The previous prime is 21098263. The next prime is 21098327. The reversal of 21098269 is 96289012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17749369 + 3348900 = 4213^2 + 1830^2 .

It is a cyclic number.

It is not a de Polignac number, because 21098269 - 2³ = 21098261 is a prime.

It is a super-2 number, since 2×21098269² = 890273909592722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21098261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10549134 + 10549135.

It is an arithmetic number, because the mean of its divisors is an integer number (10549135).

Almost surely, 2^21098269 is an apocalyptic number.

It is an amenable number.

21098269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21098269 is an equidigital number, since it uses as much as digits as its factorization.

21098269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 21098269 is about 4593.2852077789. The cubic root of 21098269 is about 276.3220921161.

The spelling of 21098269 in words is "twenty-one million, ninety-eight thousand, two hundred sixty-nine".