21844051 has 2 divisors, whose sum is σ = 21844052. Its totient is φ = 21844050.

The previous prime is 21844033. The next prime is 21844061. The reversal of 21844051 is 15044812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21844051 - 2⁵ = 21844019 is a prime.

It is not a weakly prime, because it can be changed into another prime (21844001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10922025 + 10922026.

It is an arithmetic number, because the mean of its divisors is an integer number (10922026).

Almost surely, 2^21844051 is an apocalyptic number.

21844051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21844051 is an equidigital number, since it uses as much as digits as its factorization.

21844051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 21844051 is about 4673.7619751117. The cubic root of 21844051 is about 279.5402787778.

Adding to 21844051 its reverse (15044812), we get a palindrome (36888863).

The spelling of 21844051 in words is "twenty-one million, eight hundred forty-four thousand, fifty-one".