21844061 has 2 divisors, whose sum is σ = 21844062. Its totient is φ = 21844060.

The previous prime is 21844051. The next prime is 21844063. The reversal of 21844061 is 16044812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12040900 + 9803161 = 3470^2 + 3131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21844061 is a prime.

Together with 21844063, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21844061.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21844063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10922030 + 10922031.

It is an arithmetic number, because the mean of its divisors is an integer number (10922031).

Almost surely, 2^21844061 is an apocalyptic number.

It is an amenable number.

21844061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21844061 is an equidigital number, since it uses as much as digits as its factorization.

21844061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21844061 is about 4673.7630449136. The cubic root of 21844061 is about 279.5403214347.

Adding to 21844061 its reverse (16044812), we get a palindrome (37888873).

The spelling of 21844061 in words is "twenty-one million, eight hundred forty-four thousand, sixty-one".