21234841 has 2 divisors, whose sum is σ = 21234842. Its totient is φ = 21234840.

The previous prime is 21234833. The next prime is 21234877. The reversal of 21234841 is 14843212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21196816 + 38025 = 4604^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234841 - 2³ = 21234833 is a prime.

It is equal to p_1343824 and since 21234841 and 1343824 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21234541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617420 + 10617421.

It is an arithmetic number, because the mean of its divisors is an integer number (10617421).

Almost surely, 2^21234841 is an apocalyptic number.

It is an amenable number.

21234841 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234841 is an equidigital number, since it uses as much as digits as its factorization.

21234841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 25.

The square root of 21234841 is about 4608.1277109039. The cubic root of 21234841 is about 276.9170338920.

It can be divided in two parts, 212 and 34841, that added together give a palindrome (35053).

The spelling of 21234841 in words is "twenty-one million, two hundred thirty-four thousand, eight hundred forty-one".