221163953 has 2 divisors, whose sum is σ = 221163954. Its totient is φ = 221163952.

The previous prime is 221163949. The next prime is 221163973. The reversal of 221163953 is 359361122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140019889 + 81144064 = 11833^2 + 9008^2 .

It is a cyclic number.

It is not a de Polignac number, because 221163953 - 2² = 221163949 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221163973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110581976 + 110581977.

It is an arithmetic number, because the mean of its divisors is an integer number (110581977).

Almost surely, 2^221163953 is an apocalyptic number.

It is an amenable number.

221163953 is a deficient number, since it is larger than the sum of its proper divisors (1).

221163953 is an equidigital number, since it uses as much as digits as its factorization.

221163953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 32.

The square root of 221163953 is about 14871.5820610989. The cubic root of 221163953 is about 604.7438325372.

The spelling of 221163953 in words is "two hundred twenty-one million, one hundred sixty-three thousand, nine hundred fifty-three".