21841349 has 2 divisors, whose sum is σ = 21841350. Its totient is φ = 21841348.

The previous prime is 21841331. The next prime is 21841357. The reversal of 21841349 is 94314812.

It is a happy number.

21841349 is nontrivially palindromic in base 4.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18576100 + 3265249 = 4310^2 + 1807^2 .

It is a cyclic number.

It is not a de Polignac number, because 21841349 - 2²⁰ = 20792773 is a prime.

It is a super-2 number, since 2×21841349² = 954089052279602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21841319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10920674 + 10920675.

It is an arithmetic number, because the mean of its divisors is an integer number (10920675).

Almost surely, 2^21841349 is an apocalyptic number.

It is an amenable number.

21841349 is a deficient number, since it is larger than the sum of its proper divisors (1).

21841349 is an equidigital number, since it uses as much as digits as its factorization.

21841349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 21841349 is about 4673.4729056666. The cubic root of 21841349 is about 279.5287523904.

The spelling of 21841349 in words is "twenty-one million, eight hundred forty-one thousand, three hundred forty-nine".