220121563 has 2 divisors, whose sum is σ = 220121564. Its totient is φ = 220121562.

The previous prime is 220121549. The next prime is 220121581. The reversal of 220121563 is 365121022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 220121563 - 2¹³ = 220113371 is a prime.

It is not a weakly prime, because it can be changed into another prime (220121663) 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, 110060781 + 110060782.

It is an arithmetic number, because the mean of its divisors is an integer number (110060782).

Almost surely, 2^220121563 is an apocalyptic number.

220121563 is a deficient number, since it is larger than the sum of its proper divisors (1).

220121563 is an equidigital number, since it uses as much as digits as its factorization.

220121563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 220121563 is about 14836.4942961604. The cubic root of 220121563 is about 603.7922430282.

Adding to 220121563 its reverse (365121022), we get a palindrome (585242585).

The spelling of 220121563 in words is "two hundred twenty million, one hundred twenty-one thousand, five hundred sixty-three".