21223223377 has 2 divisors, whose sum is σ = 21223223378. Its totient is φ = 21223223376.

The previous prime is 21223223279. The next prime is 21223223401. The reversal of 21223223377 is 77332232212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10713078016 + 10510145361 = 103504^2 + 102519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21223223377 is a prime.

It is not a weakly prime, because it can be changed into another prime (21223223677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611611688 + 10611611689.

It is an arithmetic number, because the mean of its divisors is an integer number (10611611689).

Almost surely, 2^21223223377 is an apocalyptic number.

It is an amenable number.

21223223377 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223223377 is an equidigital number, since it uses as much as digits as its factorization.

21223223377 is an evil number, because the sum of its binary digits is even.

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

Adding to 21223223377 its reverse (77332232212), we get a palindrome (98555455589).

The spelling of 21223223377 in words is "twenty-one billion, two hundred twenty-three million, two hundred twenty-three thousand, three hundred seventy-seven".