21926077 has 2 divisors, whose sum is σ = 21926078. Its totient is φ = 21926076.

The previous prime is 21926071. The next prime is 21926123. The reversal of 21926077 is 77062912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21427641 + 498436 = 4629^2 + 706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21926077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21926071) 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, 10963038 + 10963039.

It is an arithmetic number, because the mean of its divisors is an integer number (10963039).

Almost surely, 2^21926077 is an apocalyptic number.

It is an amenable number.

21926077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21926077 is an equidigital number, since it uses as much as digits as its factorization.

21926077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 21926077 is about 4682.5289107490. The cubic root of 21926077 is about 279.8897397500.

Adding to 21926077 its reverse (77062912), we get a palindrome (98988989).

The spelling of 21926077 in words is "twenty-one million, nine hundred twenty-six thousand, seventy-seven".