21499711 has 2 divisors, whose sum is σ = 21499712. Its totient is φ = 21499710.

The previous prime is 21499693. The next prime is 21499721. The reversal of 21499711 is 11799412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21499711 - 2⁹ = 21499199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21499721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10749855 + 10749856.

It is an arithmetic number, because the mean of its divisors is an integer number (10749856).

Almost surely, 2^21499711 is an apocalyptic number.

21499711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21499711 is an equidigital number, since it uses as much as digits as its factorization.

21499711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 34.

The square root of 21499711 is about 4636.7780839717. The cubic root of 21499711 is about 278.0636424173.

The spelling of 21499711 in words is "twenty-one million, four hundred ninety-nine thousand, seven hundred eleven".