21813040727 has 2 divisors, whose sum is σ = 21813040728. Its totient is φ = 21813040726.

The previous prime is 21813040723. The next prime is 21813040741. The reversal of 21813040727 is 72704031812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21813040727 - 2² = 21813040723 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21813040723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10906520363 + 10906520364.

It is an arithmetic number, because the mean of its divisors is an integer number (10906520364).

Almost surely, 2^21813040727 is an apocalyptic number.

21813040727 is a deficient number, since it is larger than the sum of its proper divisors (1).

21813040727 is an equidigital number, since it uses as much as digits as its factorization.

21813040727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 35.

The spelling of 21813040727 in words is "twenty-one billion, eight hundred thirteen million, forty thousand, seven hundred twenty-seven".