221841953 has 2 divisors, whose sum is σ = 221841954. Its totient is φ = 221841952.

The previous prime is 221841937. The next prime is 221842003. The reversal of 221841953 is 359148122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117332224 + 104509729 = 10832^2 + 10223^2 .

It is a cyclic number.

It is not a de Polignac number, because 221841953 - 2⁴ = 221841937 is a prime.

It is a super-2 number, since 2×221841953² = 98427704221708418, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221841253) 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, 110920976 + 110920977.

It is an arithmetic number, because the mean of its divisors is an integer number (110920977).

Almost surely, 2^221841953 is an apocalyptic number.

It is an amenable number.

221841953 is a deficient number, since it is larger than the sum of its proper divisors (1).

221841953 is an equidigital number, since it uses as much as digits as its factorization.

221841953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 221841953 is about 14894.3597714034. The cubic root of 221841953 is about 605.3611694994.

The spelling of 221841953 in words is "two hundred twenty-one million, eight hundred forty-one thousand, nine hundred fifty-three".