21298283 has 2 divisors, whose sum is σ = 21298284. Its totient is φ = 21298282.

The previous prime is 21298241. The next prime is 21298307. The reversal of 21298283 is 38289212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21298283 - 2¹⁰ = 21297259 is a prime.

It is not a weakly prime, because it can be changed into another prime (21298583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10649141 + 10649142.

It is an arithmetic number, because the mean of its divisors is an integer number (10649142).

Almost surely, 2^21298283 is an apocalyptic number.

21298283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21298283 is an equidigital number, since it uses as much as digits as its factorization.

21298283 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 21298283 is about 4615.0062838527. The cubic root of 21298283 is about 277.1925355808.

The spelling of 21298283 in words is "twenty-one million, two hundred ninety-eight thousand, two hundred eighty-three".