221552393 has 2 divisors, whose sum is σ = 221552394. Its totient is φ = 221552392.

The previous prime is 221552341. The next prime is 221552453. The reversal of 221552393 is 393255122.

221552393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141324544 + 80227849 = 11888^2 + 8957^2 .

It is a cyclic number.

It is not a de Polignac number, because 221552393 - 2⁶ = 221552329 is a prime.

It is not a weakly prime, because it can be changed into another prime (221552593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110776196 + 110776197.

It is an arithmetic number, because the mean of its divisors is an integer number (110776197).

Almost surely, 2^221552393 is an apocalyptic number.

It is an amenable number.

221552393 is a deficient number, since it is larger than the sum of its proper divisors (1).

221552393 is an equidigital number, since it uses as much as digits as its factorization.

221552393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 32.

The square root of 221552393 is about 14884.6361393216. The cubic root of 221552393 is about 605.0976715474.

The spelling of 221552393 in words is "two hundred twenty-one million, five hundred fifty-two thousand, three hundred ninety-three".