21012283 has 2 divisors, whose sum is σ = 21012284. Its totient is φ = 21012282.

The previous prime is 21012281. The next prime is 21012301. The reversal of 21012283 is 38221012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012283 - 2¹ = 21012281 is a prime.

Together with 21012281, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21012283.

It is not a weakly prime, because it can be changed into another prime (21012281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506141 + 10506142.

It is an arithmetic number, because the mean of its divisors is an integer number (10506142).

Almost surely, 2^21012283 is an apocalyptic number.

21012283 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012283 is an equidigital number, since it uses as much as digits as its factorization.

21012283 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21012283 is about 4583.9156842158. The cubic root of 21012283 is about 275.9461974171.

Adding to 21012283 its reverse (38221012), we get a palindrome (59233295).

The spelling of 21012283 in words is "twenty-one million, twelve thousand, two hundred eighty-three".