21164029 has 2 divisors, whose sum is σ = 21164030. Its totient is φ = 21164028.

The previous prime is 21163999. The next prime is 21164047. The reversal of 21164029 is 92046112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13155129 + 8008900 = 3627^2 + 2830^2 .

It is a cyclic number.

It is not a de Polignac number, because 21164029 - 2¹¹ = 21161981 is a prime.

It is a super-2 number, since 2×21164029² = 895832247025682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21163994 and 21164012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21164929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10582014 + 10582015.

It is an arithmetic number, because the mean of its divisors is an integer number (10582015).

Almost surely, 2^21164029 is an apocalyptic number.

It is an amenable number.

21164029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21164029 is an equidigital number, since it uses as much as digits as its factorization.

21164029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 21164029 is about 4600.4379139382. The cubic root of 21164029 is about 276.6088785936.

The spelling of 21164029 in words is "twenty-one million, one hundred sixty-four thousand, twenty-nine".