21740711 has 2 divisors, whose sum is σ = 21740712. Its totient is φ = 21740710.

The previous prime is 21740687. The next prime is 21740717. The reversal of 21740711 is 11704712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21740711 - 2⁶ = 21740647 is a prime.

It is a Sophie Germain 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 (21740717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10870355 + 10870356.

It is an arithmetic number, because the mean of its divisors is an integer number (10870356).

Almost surely, 2^21740711 is an apocalyptic number.

21740711 is a deficient number, since it is larger than the sum of its proper divisors (1).

21740711 is an equidigital number, since it uses as much as digits as its factorization.

21740711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 21740711 is about 4662.6935348573. The cubic root of 21740711 is about 279.0987647236.

The spelling of 21740711 in words is "twenty-one million, seven hundred forty thousand, seven hundred eleven".