221346739 has 2 divisors, whose sum is σ = 221346740. Its totient is φ = 221346738.

The previous prime is 221346721. The next prime is 221346767. The reversal of 221346739 is 937643122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221346739 - 2⁷ = 221346611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221346698 and 221346707.

It is not a weakly prime, because it can be changed into another prime (221326739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110673369 + 110673370.

It is an arithmetic number, because the mean of its divisors is an integer number (110673370).

Almost surely, 2^221346739 is an apocalyptic number.

221346739 is a deficient number, since it is larger than the sum of its proper divisors (1).

221346739 is an equidigital number, since it uses as much as digits as its factorization.

221346739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 37.

The square root of 221346739 is about 14877.7262711746. The cubic root of 221346739 is about 604.9103881117.

The spelling of 221346739 in words is "two hundred twenty-one million, three hundred forty-six thousand, seven hundred thirty-nine".