21173701 has 2 divisors, whose sum is σ = 21173702. Its totient is φ = 21173700.

The previous prime is 21173699. The next prime is 21173717. The reversal of 21173701 is 10737112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19351201 + 1822500 = 4399^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 21173701 - 2¹ = 21173699 is a prime.

It is a super-2 number, since 2×21173701² = 896651228074802, which contains 22 as substring.

Together with 21173699, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21173791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10586850 + 10586851.

It is an arithmetic number, because the mean of its divisors is an integer number (10586851).

Almost surely, 2^21173701 is an apocalyptic number.

It is an amenable number.

21173701 is a deficient number, since it is larger than the sum of its proper divisors (1).

21173701 is an equidigital number, since it uses as much as digits as its factorization.

21173701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 21173701 is about 4601.4889981396. The cubic root of 21173701 is about 276.6510090976.

The spelling of 21173701 in words is "twenty-one million, one hundred seventy-three thousand, seven hundred one".