21411011 has 2 divisors, whose sum is σ = 21411012. Its totient is φ = 21411010.

The previous prime is 21410981. The next prime is 21411017. The reversal of 21411011 is 11011412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21411011 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21410983 and 21411001.

It is not a weakly prime, because it can be changed into another prime (21411017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10705505 + 10705506.

It is an arithmetic number, because the mean of its divisors is an integer number (10705506).

Almost surely, 2^21411011 is an apocalyptic number.

21411011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21411011 is an equidigital number, since it uses as much as digits as its factorization.

21411011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 21411011 is about 4627.2033670458. The cubic root of 21411011 is about 277.6807187955.

Adding to 21411011 its reverse (11011412), we get a palindrome (32422423).

The spelling of 21411011 in words is "twenty-one million, four hundred eleven thousand, eleven".