21266298 has 12 divisors (see below), whose sum is σ = 46077018. Its totient is φ = 7088760.

The previous prime is 21266293. The next prime is 21266299. The reversal of 21266298 is 89266212.

It is a happy number.

21266298 is a `hidden beast` number, since 2 + 1 + 26 + 629 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15944049 + 5322249 = 3993^2 + 2307^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21266291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 590713 + ... + 590748.

Almost surely, 2^21266298 is an apocalyptic number.

21266298 is an abundant number, since it is smaller than the sum of its proper divisors (24810720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21266298 is a wasteful number, since it uses less digits than its factorization.

21266298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181469 (or 1181466 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 21266298 is about 4611.5396561235. The cubic root of 21266298 is about 277.0537067814.

The spelling of 21266298 in words is "twenty-one million, two hundred sixty-six thousand, two hundred ninety-eight".