21183469 has 2 divisors, whose sum is σ = 21183470. Its totient is φ = 21183468.

The previous prime is 21183467. The next prime is 21183493. The reversal of 21183469 is 96438112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17322244 + 3861225 = 4162^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 21183469 - 2¹ = 21183467 is a prime.

It is a super-2 number, since 2×21183469² = 897478717747922, which contains 22 as substring.

Together with 21183467, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21183467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10591734 + 10591735.

It is an arithmetic number, because the mean of its divisors is an integer number (10591735).

Almost surely, 2^21183469 is an apocalyptic number.

It is an amenable number.

21183469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21183469 is an equidigital number, since it uses as much as digits as its factorization.

21183469 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 21183469 is about 4602.5502713170. The cubic root of 21183469 is about 276.6935447509.

The spelling of 21183469 in words is "twenty-one million, one hundred eighty-three thousand, four hundred sixty-nine".