21385283 has 2 divisors, whose sum is σ = 21385284. Its totient is φ = 21385282.

The previous prime is 21385253. The next prime is 21385307. The reversal of 21385283 is 38258312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21385283 - 2¹⁴ = 21368899 is a prime.

It is not a weakly prime, because it can be changed into another prime (21385253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10692641 + 10692642.

It is an arithmetic number, because the mean of its divisors is an integer number (10692642).

Almost surely, 2^21385283 is an apocalyptic number.

21385283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21385283 is an equidigital number, since it uses as much as digits as its factorization.

21385283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 32.

The square root of 21385283 is about 4624.4224504256. The cubic root of 21385283 is about 277.5694515449.

The spelling of 21385283 in words is "twenty-one million, three hundred eighty-five thousand, two hundred eighty-three".