21232403077 has 2 divisors, whose sum is σ = 21232403078. Its totient is φ = 21232403076.

The previous prime is 21232403063. The next prime is 21232403141. The reversal of 21232403077 is 77030423212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18179398561 + 3053004516 = 134831^2 + 55254^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232403077 - 2⁷ = 21232402949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232403177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616201538 + 10616201539.

It is an arithmetic number, because the mean of its divisors is an integer number (10616201539).

Almost surely, 2^21232403077 is an apocalyptic number.

It is an amenable number.

21232403077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232403077 is an equidigital number, since it uses as much as digits as its factorization.

21232403077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 31.

Adding to 21232403077 its reverse (77030423212), we get a palindrome (98262826289).

The spelling of 21232403077 in words is "twenty-one billion, two hundred thirty-two million, four hundred three thousand, seventy-seven".