21167077 has 2 divisors, whose sum is σ = 21167078. Its totient is φ = 21167076.

The previous prime is 21167053. The next prime is 21167093. The reversal of 21167077 is 77076112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 863041 = 4506^2 + 929^2 .

It is a cyclic number.

It is not a de Polignac number, because 21167077 - 2⁷ = 21166949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21167677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10583538 + 10583539.

It is an arithmetic number, because the mean of its divisors is an integer number (10583539).

Almost surely, 2^21167077 is an apocalyptic number.

It is an amenable number.

21167077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21167077 is an equidigital number, since it uses as much as digits as its factorization.

21167077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4116, while the sum is 31.

The square root of 21167077 is about 4600.7691748228. The cubic root of 21167077 is about 276.6221568370.

The spelling of 21167077 in words is "twenty-one million, one hundred sixty-seven thousand, seventy-seven".