21233161823777 has 2 divisors, whose sum is σ = 21233161823778. Its totient is φ = 21233161823776.

The previous prime is 21233161823761. The next prime is 21233161823821. The reversal of 21233161823777 is 77732816133212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20518580705536 + 714581118241 = 4529744^2 + 845329^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233161823777 - 2⁴ = 21233161823761 is a prime.

It is a super-2 number, since 2×21233161823777² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21233161823717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616580911888 + 10616580911889.

It is an arithmetic number, because the mean of its divisors is an integer number (10616580911889).

Almost surely, 2^{21233161823777} is an apocalyptic number.

It is an amenable number.

21233161823777 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233161823777 is an equidigital number, since it uses as much as digits as its factorization.

21233161823777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 53.

Adding to 21233161823777 its reverse (77732816133212), we get a palindrome (98965977956989).

The spelling of 21233161823777 in words is "twenty-one trillion, two hundred thirty-three billion, one hundred sixty-one million, eight hundred twenty-three thousand, seven hundred seventy-seven".