21846469 has 2 divisors, whose sum is σ = 21846470. Its totient is φ = 21846468.

The previous prime is 21846467. The next prime is 21846497. The reversal of 21846469 is 96464812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21734244 + 112225 = 4662^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 21846469 - 2¹ = 21846467 is a prime.

It is a super-2 number, since 2×21846469² = 954536415535922, which contains 22 as substring.

Together with 21846467, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21846463) 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, 10923234 + 10923235.

It is an arithmetic number, because the mean of its divisors is an integer number (10923235).

Almost surely, 2^21846469 is an apocalyptic number.

It is an amenable number.

21846469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21846469 is an equidigital number, since it uses as much as digits as its factorization.

21846469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 40.

The square root of 21846469 is about 4674.0206460819. The cubic root of 21846469 is about 279.5505928515.

The spelling of 21846469 in words is "twenty-one million, eight hundred forty-six thousand, four hundred sixty-nine".