21011759 has 2 divisors, whose sum is σ = 21011760. Its totient is φ = 21011758.

The previous prime is 21011741. The next prime is 21011761. The reversal of 21011759 is 95711012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011759 - 2⁸ = 21011503 is a prime.

Together with 21011761, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505879 + 10505880.

It is an arithmetic number, because the mean of its divisors is an integer number (10505880).

Almost surely, 2^21011759 is an apocalyptic number.

21011759 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011759 is an equidigital number, since it uses as much as digits as its factorization.

21011759 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 21011759 is about 4583.8585274853. The cubic root of 21011759 is about 275.9439035681.

The spelling of 21011759 in words is "twenty-one million, eleven thousand, seven hundred fifty-nine".