21248411 has 2 divisors, whose sum is σ = 21248412. Its totient is φ = 21248410.

The previous prime is 21248401. The next prime is 21248417. The reversal of 21248411 is 11484212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21248411 is a prime.

It is a Chen prime.

It is equal to p_1344623 and since 21248411 and 1344623 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21248417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10624205 + 10624206.

It is an arithmetic number, because the mean of its divisors is an integer number (10624206).

Almost surely, 2^21248411 is an apocalyptic number.

21248411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21248411 is an equidigital number, since it uses as much as digits as its factorization.

21248411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 23.

The square root of 21248411 is about 4609.5998741756. The cubic root of 21248411 is about 276.9760087308.

The spelling of 21248411 in words is "twenty-one million, two hundred forty-eight thousand, four hundred eleven".