21053941 has 2 divisors, whose sum is σ = 21053942. Its totient is φ = 21053940.

The previous prime is 21053909. The next prime is 21053969. The reversal of 21053941 is 14935012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15437041 + 5616900 = 3929^2 + 2370^2 .

It is a cyclic number.

It is not a de Polignac number, because 21053941 - 2⁵ = 21053909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21053041) 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, 10526970 + 10526971.

It is an arithmetic number, because the mean of its divisors is an integer number (10526971).

Almost surely, 2^21053941 is an apocalyptic number.

It is an amenable number.

21053941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21053941 is an equidigital number, since it uses as much as digits as its factorization.

21053941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21053941 is about 4588.4573660436. The cubic root of 21053941 is about 276.1284365121.

Adding to 21053941 its reverse (14935012), we get a palindrome (35988953).

The spelling of 21053941 in words is "twenty-one million, fifty-three thousand, nine hundred forty-one".