221883929 has 2 divisors, whose sum is σ = 221883930. Its totient is φ = 221883928.

The previous prime is 221883887. The next prime is 221883941. The reversal of 221883929 is 929388122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167832025 + 54051904 = 12955^2 + 7352^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221883929 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221883929.

It is not a weakly prime, because it can be changed into another prime (221883979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110941964 + 110941965.

It is an arithmetic number, because the mean of its divisors is an integer number (110941965).

Almost surely, 2^221883929 is an apocalyptic number.

It is an amenable number.

221883929 is a deficient number, since it is larger than the sum of its proper divisors (1).

221883929 is an equidigital number, since it uses as much as digits as its factorization.

221883929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The square root of 221883929 is about 14895.7688287648. The cubic root of 221883929 is about 605.3993483885.

The spelling of 221883929 in words is "two hundred twenty-one million, eight hundred eighty-three thousand, nine hundred twenty-nine".