21293711 has 2 divisors, whose sum is σ = 21293712. Its totient is φ = 21293710.

The previous prime is 21293693. The next prime is 21293717. The reversal of 21293711 is 11739212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21293711 - 2⁶ = 21293647 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21293717) 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, 10646855 + 10646856.

It is an arithmetic number, because the mean of its divisors is an integer number (10646856).

Almost surely, 2^21293711 is an apocalyptic number.

21293711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21293711 is an equidigital number, since it uses as much as digits as its factorization.

21293711 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 26.

The square root of 21293711 is about 4614.5109166628. The cubic root of 21293711 is about 277.1726996318.

The spelling of 21293711 in words is "twenty-one million, two hundred ninety-three thousand, seven hundred eleven".