21773443577 has 2 divisors, whose sum is σ = 21773443578. Its totient is φ = 21773443576.

The previous prime is 21773443519. The next prime is 21773443621. The reversal of 21773443577 is 77534437712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14867168761 + 6906274816 = 121931^2 + 83104^2 .

It is a cyclic number.

It is not a de Polignac number, because 21773443577 - 2²⁴ = 21756666361 is a prime.

It is not a weakly prime, because it can be changed into another prime (21773443507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10886721788 + 10886721789.

It is an arithmetic number, because the mean of its divisors is an integer number (10886721789).

Almost surely, 2^21773443577 is an apocalyptic number.

It is an amenable number.

21773443577 is a deficient number, since it is larger than the sum of its proper divisors (1).

21773443577 is an equidigital number, since it uses as much as digits as its factorization.

21773443577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3457440, while the sum is 50.

The spelling of 21773443577 in words is "twenty-one billion, seven hundred seventy-three million, four hundred forty-three thousand, five hundred seventy-seven".