21954241 has 2 divisors, whose sum is σ = 21954242. Its totient is φ = 21954240.

The previous prime is 21954227. The next prime is 21954263. The reversal of 21954241 is 14245912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14984641 + 6969600 = 3871^2 + 2640^2 .

It is a cyclic number.

It is not a de Polignac number, because 21954241 - 2¹¹ = 21952193 is a prime.

It is not a weakly prime, because it can be changed into another prime (21954211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10977120 + 10977121.

It is an arithmetic number, because the mean of its divisors is an integer number (10977121).

Almost surely, 2^21954241 is an apocalyptic number.

It is an amenable number.

21954241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21954241 is an equidigital number, since it uses as much as digits as its factorization.

21954241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 21954241 is about 4685.5352949263. The cubic root of 21954241 is about 280.0095277370.

The spelling of 21954241 in words is "twenty-one million, nine hundred fifty-four thousand, two hundred forty-one".