21232223377 has 2 divisors, whose sum is σ = 21232223378. Its totient is φ = 21232223376.

The previous prime is 21232223317. The next prime is 21232223393. The reversal of 21232223377 is 77332223212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21099305536 + 132917841 = 145256^2 + 11529^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21232223377 is a prime.

It is not a weakly prime, because it can be changed into another prime (21232223317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616111688 + 10616111689.

It is an arithmetic number, because the mean of its divisors is an integer number (10616111689).

Almost surely, 2^21232223377 is an apocalyptic number.

It is an amenable number.

21232223377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232223377 is an equidigital number, since it uses as much as digits as its factorization.

21232223377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 34.

Adding to 21232223377 its reverse (77332223212), we get a palindrome (98564446589).

The spelling of 21232223377 in words is "twenty-one billion, two hundred thirty-two million, two hundred twenty-three thousand, three hundred seventy-seven".