21772163743277 has 2 divisors, whose sum is σ = 21772163743278. Its totient is φ = 21772163743276.

The previous prime is 21772163743201. The next prime is 21772163743289. The reversal of 21772163743277 is 77234736127712.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21595993828201 + 176169915076 = 4647149^2 + 419726^2 .

It is a cyclic number.

It is not a de Polignac number, because 21772163743277 - 2⁸ = 21772163743021 is a prime.

It is a super-2 number, since 2×21772163743277² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21772163763277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10886081871638 + 10886081871639.

It is an arithmetic number, because the mean of its divisors is an integer number (10886081871639).

Almost surely, 2^{21772163743277} is an apocalyptic number.

It is an amenable number.

21772163743277 is a deficient number, since it is larger than the sum of its proper divisors (1).

21772163743277 is an equidigital number, since it uses as much as digits as its factorization.

21772163743277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29042496, while the sum is 59.

The spelling of 21772163743277 in words is "twenty-one trillion, seven hundred seventy-two billion, one hundred sixty-three million, seven hundred forty-three thousand, two hundred seventy-seven".