21228341 has 2 divisors, whose sum is σ = 21228342. Its totient is φ = 21228340.

The previous prime is 21228331. The next prime is 21228371. The reversal of 21228341 is 14382212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 206116 = 4585^2 + 454^2 .

It is a cyclic number.

It is not a de Polignac number, because 21228341 - 2¹⁰ = 21227317 is a prime.

It is a super-2 number, since 2×21228341² = 901284923224562, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1343444 and since 21228341 and 1343444 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21228331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10614170 + 10614171.

It is an arithmetic number, because the mean of its divisors is an integer number (10614171).

Almost surely, 2^21228341 is an apocalyptic number.

It is an amenable number.

21228341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21228341 is an equidigital number, since it uses as much as digits as its factorization.

21228341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 23.

The square root of 21228341 is about 4607.4223813321. The cubic root of 21228341 is about 276.8887761746. Note that the first 3 decimals are identical.

The spelling of 21228341 in words is "twenty-one million, two hundred twenty-eight thousand, three hundred forty-one".