21232230077 has 2 divisors, whose sum is σ = 21232230078. Its totient is φ = 21232230076.

The previous prime is 21232230059. The next prime is 21232230127. The reversal of 21232230077 is 77003223212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11531752996 + 9700477081 = 107386^2 + 98491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232230077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232230007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616115038 + 10616115039.

It is an arithmetic number, because the mean of its divisors is an integer number (10616115039).

Almost surely, 2^21232230077 is an apocalyptic number.

It is an amenable number.

21232230077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232230077 is an equidigital number, since it uses as much as digits as its factorization.

21232230077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 29.

Adding to 21232230077 its reverse (77003223212), we get a palindrome (98235453289).

The spelling of 21232230077 in words is "twenty-one billion, two hundred thirty-two million, two hundred thirty thousand, seventy-seven".