221020039 has 2 divisors, whose sum is σ = 221020040. Its totient is φ = 221020038.

The previous prime is 221020003. The next prime is 221020057. The reversal of 221020039 is 930020122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221019998 and 221020025.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020099) 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, 110510019 + 110510020.

It is an arithmetic number, because the mean of its divisors is an integer number (110510020).

Almost surely, 2^221020039 is an apocalyptic number.

221020039 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020039 is an equidigital number, since it uses as much as digits as its factorization.

221020039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 221020039 is about 14866.7427165469. The cubic root of 221020039 is about 604.6126327539.

The spelling of 221020039 in words is "two hundred twenty-one million, twenty thousand, thirty-nine".