21926441 has 2 divisors, whose sum is σ = 21926442. Its totient is φ = 21926440.

The previous prime is 21926419. The next prime is 21926449. The reversal of 21926441 is 14462912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 2310400 = 4429^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 21926441 - 2¹⁸ = 21664297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21926449) 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, 10963220 + 10963221.

It is an arithmetic number, because the mean of its divisors is an integer number (10963221).

Almost surely, 2^21926441 is an apocalyptic number.

It is an amenable number.

21926441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21926441 is an equidigital number, since it uses as much as digits as its factorization.

21926441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 21926441 is about 4682.5677784737. The cubic root of 21926441 is about 279.8912885800.

The spelling of 21926441 in words is "twenty-one million, nine hundred twenty-six thousand, four hundred forty-one".