105622721 has 2 divisors, whose sum is σ = 105622722. Its totient is φ = 105622720.

The previous prime is 105622711. The next prime is 105622723. The reversal of 105622721 is 127226501.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55056400 + 50566321 = 7420^2 + 7111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105622721 is a prime.

It is a super-2 number, since 2×105622721² = 22312318382887682, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 105622723, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (105622723) 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, 52811360 + 52811361.

It is an arithmetic number, because the mean of its divisors is an integer number (52811361).

Almost surely, 2^105622721 is an apocalyptic number.

It is an amenable number.

105622721 is a deficient number, since it is larger than the sum of its proper divisors (1).

105622721 is an equidigital number, since it uses as much as digits as its factorization.

105622721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 105622721 is about 10277.2915206294. The cubic root of 105622721 is about 472.7001975382.

The spelling of 105622721 in words is "one hundred five million, six hundred twenty-two thousand, seven hundred twenty-one".