21346469 has 2 divisors, whose sum is σ = 21346470. Its totient is φ = 21346468.

The previous prime is 21346459. The next prime is 21346477. The reversal of 21346469 is 96464312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15880225 + 5466244 = 3985^2 + 2338^2 .

It is a cyclic number.

It is not a de Polignac number, because 21346469 - 2⁴ = 21346453 is a prime.

It is a super-2 number, since 2×21346469² = 911343477535922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21346459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10673234 + 10673235.

It is an arithmetic number, because the mean of its divisors is an integer number (10673235).

Almost surely, 2^21346469 is an apocalyptic number.

It is an amenable number.

21346469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21346469 is an equidigital number, since it uses as much as digits as its factorization.

21346469 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 21346469 is about 4620.2239123229. The cubic root of 21346469 is about 277.4014215771.

The spelling of 21346469 in words is "twenty-one million, three hundred forty-six thousand, four hundred sixty-nine".