21417422077 has 2 divisors, whose sum is σ = 21417422078. Its totient is φ = 21417422076.

The previous prime is 21417422071. The next prime is 21417422083. The reversal of 21417422077 is 77022471412.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21417422071) and next prime (21417422083).

It can be written as a sum of positive squares in only one way, i.e., 10768420441 + 10649001636 = 103771^2 + 103194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21417422077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21417422071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10708711038 + 10708711039.

It is an arithmetic number, because the mean of its divisors is an integer number (10708711039).

Almost surely, 2^21417422077 is an apocalyptic number.

It is an amenable number.

21417422077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21417422077 is an equidigital number, since it uses as much as digits as its factorization.

21417422077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43904, while the sum is 37.

Adding to 21417422077 its reverse (77022471412), we get a palindrome (98439893489).

The spelling of 21417422077 in words is "twenty-one billion, four hundred seventeen million, four hundred twenty-two thousand, seventy-seven".