221384633 has 2 divisors, whose sum is σ = 221384634. Its totient is φ = 221384632.

The previous prime is 221384621. The next prime is 221384651. The reversal of 221384633 is 336483122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198612649 + 22771984 = 14093^2 + 4772^2 .

It is a cyclic number.

It is not a de Polignac number, because 221384633 - 2²⁰ = 220336057 is a prime.

It is a super-2 number, since 2×221384633² = 98022311457089378, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221384633.

It is not a weakly prime, because it can be changed into another prime (221384533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110692316 + 110692317.

It is an arithmetic number, because the mean of its divisors is an integer number (110692317).

Almost surely, 2^221384633 is an apocalyptic number.

It is an amenable number.

221384633 is a deficient number, since it is larger than the sum of its proper divisors (1).

221384633 is an equidigital number, since it uses as much as digits as its factorization.

221384633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 32.

The square root of 221384633 is about 14878.9997311647. Note that the first 3 decimals coincide. The cubic root of 221384633 is about 604.9449058498.

The spelling of 221384633 in words is "two hundred twenty-one million, three hundred eighty-four thousand, six hundred thirty-three".