221967701 has 2 divisors, whose sum is σ = 221967702. Its totient is φ = 221967700.

The previous prime is 221967689. The next prime is 221967703. The reversal of 221967701 is 107769122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128845201 + 93122500 = 11351^2 + 9650^2 .

It is a cyclic number.

It is not a de Polignac number, because 221967701 - 2¹⁸ = 221705557 is a prime.

Together with 221967703, 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 (221967703) 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, 110983850 + 110983851.

It is an arithmetic number, because the mean of its divisors is an integer number (110983851).

Almost surely, 2^221967701 is an apocalyptic number.

It is an amenable number.

221967701 is a deficient number, since it is larger than the sum of its proper divisors (1).

221967701 is an equidigital number, since it uses as much as digits as its factorization.

221967701 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 35.

The square root of 221967701 is about 14898.5805028533. The cubic root of 221967701 is about 605.4755280578.

The spelling of 221967701 in words is "two hundred twenty-one million, nine hundred sixty-seven thousand, seven hundred one".