221196947 has 2 divisors, whose sum is σ = 221196948. Its totient is φ = 221196946.

The previous prime is 221196901. The next prime is 221196953. The reversal of 221196947 is 749691122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221196947 - 2⁶ = 221196883 is a prime.

It is not a weakly prime, because it can be changed into another prime (221196047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110598473 + 110598474.

It is an arithmetic number, because the mean of its divisors is an integer number (110598474).

Almost surely, 2^221196947 is an apocalyptic number.

221196947 is a deficient number, since it is larger than the sum of its proper divisors (1).

221196947 is an equidigital number, since it uses as much as digits as its factorization.

221196947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 221196947 is about 14872.6913166380. The cubic root of 221196947 is about 604.7739036309.

The spelling of 221196947 in words is "two hundred twenty-one million, one hundred ninety-six thousand, nine hundred forty-seven".