21011411 has 2 divisors, whose sum is σ = 21011412. Its totient is φ = 21011410.

The previous prime is 21011383. The next prime is 21011413. The reversal of 21011411 is 11411012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011411 - 2²² = 16817107 is a prime.

It is a Sophie Germain prime.

Together with 21011413, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21011392 and 21011401.

It is not a weakly prime, because it can be changed into another prime (21011413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505705 + 10505706.

It is an arithmetic number, because the mean of its divisors is an integer number (10505706).

Almost surely, 2^21011411 is an apocalyptic number.

21011411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011411 is an equidigital number, since it uses as much as digits as its factorization.

21011411 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 21011411 is about 4583.8205680415. The cubic root of 21011411 is about 275.9423801512.

Adding to 21011411 its reverse (11411012), we get a palindrome (32422423).

The spelling of 21011411 in words is "twenty-one million, eleven thousand, four hundred eleven".