21724640011 has 2 divisors, whose sum is σ = 21724640012. Its totient is φ = 21724640010.

The previous prime is 21724639999. The next prime is 21724640023. The reversal of 21724640011 is 11004642712.

It is a balanced prime because it is at equal distance from previous prime (21724639999) and next prime (21724640023).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21724640011 is a prime.

It is not a weakly prime, because it can be changed into another prime (21724640081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10862320005 + 10862320006.

It is an arithmetic number, because the mean of its divisors is an integer number (10862320006).

Almost surely, 2^21724640011 is an apocalyptic number.

21724640011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21724640011 is an equidigital number, since it uses as much as digits as its factorization.

21724640011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The spelling of 21724640011 in words is "twenty-one billion, seven hundred twenty-four million, six hundred forty thousand, eleven".