21448711 has 2 divisors, whose sum is σ = 21448712. Its totient is φ = 21448710.

The previous prime is 21448667. The next prime is 21448723. The reversal of 21448711 is 11784412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21448711 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21448711.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21443711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10724355 + 10724356.

It is an arithmetic number, because the mean of its divisors is an integer number (10724356).

Almost surely, 2^21448711 is an apocalyptic number.

21448711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21448711 is an equidigital number, since it uses as much as digits as its factorization.

21448711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1792, while the sum is 28.

The square root of 21448711 is about 4631.2753103222. The cubic root of 21448711 is about 277.8436011062.

The spelling of 21448711 in words is "twenty-one million, four hundred forty-eight thousand, seven hundred eleven".