21068611 has 4 divisors (see below), whose sum is σ = 21365424. Its totient is φ = 20771800.

The previous prime is 21068609. The next prime is 21068617. The reversal of 21068611 is 11686012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21068611 - 2¹ = 21068609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21068617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148300 + ... + 148441.

It is an arithmetic number, because the mean of its divisors is an integer number (5341356).

Almost surely, 2^21068611 is an apocalyptic number.

21068611 is a deficient number, since it is larger than the sum of its proper divisors (296813).

21068611 is an equidigital number, since it uses as much as digits as its factorization.

21068611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296812.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 21068611 is about 4590.0556641505. The cubic root of 21068611 is about 276.1925553658.

The spelling of 21068611 in words is "twenty-one million, sixty-eight thousand, six hundred eleven".