221939329 has 2 divisors, whose sum is σ = 221939330. Its totient is φ = 221939328.

The previous prime is 221939321. The next prime is 221939339. The reversal of 221939329 is 923939122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220463104 + 1476225 = 14848^2 + 1215^2 .

It is a cyclic number.

It is not a de Polignac number, because 221939329 - 2³ = 221939321 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221939291 and 221939300.

It is not a weakly prime, because it can be changed into another prime (221939321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110969664 + 110969665.

It is an arithmetic number, because the mean of its divisors is an integer number (110969665).

Almost surely, 2^221939329 is an apocalyptic number.

It is an amenable number.

221939329 is a deficient number, since it is larger than the sum of its proper divisors (1).

221939329 is an equidigital number, since it uses as much as digits as its factorization.

221939329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 40.

The square root of 221939329 is about 14897.6283011760. The cubic root of 221939329 is about 605.4497295842.

The spelling of 221939329 in words is "two hundred twenty-one million, nine hundred thirty-nine thousand, three hundred twenty-nine".