221163893 has 2 divisors, whose sum is σ = 221163894. Its totient is φ = 221163892.

The previous prime is 221163871. The next prime is 221163941. The reversal of 221163893 is 398361122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215003569 + 6160324 = 14663^2 + 2482^2 .

It is a cyclic number.

It is not a de Polignac number, because 221163893 - 2⁸ = 221163637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221163493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110581946 + 110581947.

It is an arithmetic number, because the mean of its divisors is an integer number (110581947).

Almost surely, 2^221163893 is an apocalyptic number.

It is an amenable number.

221163893 is a deficient number, since it is larger than the sum of its proper divisors (1).

221163893 is an equidigital number, since it uses as much as digits as its factorization.

221163893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 221163893 is about 14871.5800438286. The cubic root of 221163893 is about 604.7437778498.

The spelling of 221163893 in words is "two hundred twenty-one million, one hundred sixty-three thousand, eight hundred ninety-three".