21404010241 has 2 divisors, whose sum is σ = 21404010242. Its totient is φ = 21404010240.

The previous prime is 21404010223. The next prime is 21404010247. The reversal of 21404010241 is 14201040412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19121081841 + 2282928400 = 138279^2 + 47780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21404010241 is a prime.

It is not a weakly prime, because it can be changed into another prime (21404010247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702005120 + 10702005121.

It is an arithmetic number, because the mean of its divisors is an integer number (10702005121).

Almost surely, 2^21404010241 is an apocalyptic number.

It is an amenable number.

21404010241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404010241 is an equidigital number, since it uses as much as digits as its factorization.

21404010241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21404010241 its reverse (14201040412), we get a palindrome (35605050653).

The spelling of 21404010241 in words is "twenty-one billion, four hundred four million, ten thousand, two hundred forty-one".