220940971 has 2 divisors, whose sum is σ = 220940972. Its totient is φ = 220940970.

The previous prime is 220940957. The next prime is 220940977. The reversal of 220940971 is 179049022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220940971 - 2⁵ = 220940939 is a prime.

It is not a weakly prime, because it can be changed into another prime (220940977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110470485 + 110470486.

It is an arithmetic number, because the mean of its divisors is an integer number (110470486).

Almost surely, 2^220940971 is an apocalyptic number.

220940971 is a deficient number, since it is larger than the sum of its proper divisors (1).

220940971 is an equidigital number, since it uses as much as digits as its factorization.

220940971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 220940971 is about 14864.0832546108. The cubic root of 220940971 is about 604.5405258480.

Adding to 220940971 its reverse (179049022), we get a palindrome (399989993).

The spelling of 220940971 in words is "two hundred twenty million, nine hundred forty thousand, nine hundred seventy-one".