21441011 has 2 divisors, whose sum is σ = 21441012. Its totient is φ = 21441010.

The previous prime is 21441001. The next prime is 21441031. The reversal of 21441011 is 11014412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21441011 - 2¹⁰ = 21439987 is a prime.

It is not a weakly prime, because it can be changed into another prime (21441001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10720505 + 10720506.

It is an arithmetic number, because the mean of its divisors is an integer number (10720506).

Almost surely, 2^21441011 is an apocalyptic number.

21441011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21441011 is an equidigital number, since it uses as much as digits as its factorization.

21441011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 21441011 is about 4630.4439312014. The cubic root of 21441011 is about 277.8103488859.

Adding to 21441011 its reverse (11014412), we get a palindrome (32455423).

The spelling of 21441011 in words is "twenty-one million, four hundred forty-one thousand, eleven".