21232313321077 has 2 divisors, whose sum is σ = 21232313321078. Its totient is φ = 21232313321076.

The previous prime is 21232313321027. The next prime is 21232313321111. The reversal of 21232313321077 is 77012331323212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18525715830801 + 2706597490276 = 4304151^2 + 1645174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232313321077 is a prime.

It is a super-2 number, since 2×21232313321077² (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 (21232313321017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616156660538 + 10616156660539.

It is an arithmetic number, because the mean of its divisors is an integer number (10616156660539).

Almost surely, 2^{21232313321077} is an apocalyptic number.

It is an amenable number.

21232313321077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232313321077 is an equidigital number, since it uses as much as digits as its factorization.

21232313321077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 37.

Adding to 21232313321077 its reverse (77012331323212), we get a palindrome (98244644644289).

The spelling of 21232313321077 in words is "twenty-one trillion, two hundred thirty-two billion, three hundred thirteen million, three hundred twenty-one thousand, seventy-seven".