21761423713 has 2 divisors, whose sum is σ = 21761423714. Its totient is φ = 21761423712.

The previous prime is 21761423681. The next prime is 21761423743. The reversal of 21761423713 is 31732416712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18302572369 + 3458851344 = 135287^2 + 58812^2 .

It is a cyclic number.

It is not a de Polignac number, because 21761423713 - 2⁵ = 21761423681 is a prime.

It is not a weakly prime, because it can be changed into another prime (21761423743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10880711856 + 10880711857.

It is an arithmetic number, because the mean of its divisors is an integer number (10880711857).

Almost surely, 2^21761423713 is an apocalyptic number.

It is an amenable number.

21761423713 is a deficient number, since it is larger than the sum of its proper divisors (1).

21761423713 is an equidigital number, since it uses as much as digits as its factorization.

21761423713 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 37.

The spelling of 21761423713 in words is "twenty-one billion, seven hundred sixty-one million, four hundred twenty-three thousand, seven hundred thirteen".