219888954221 has 2 divisors, whose sum is σ = 219888954222. Its totient is φ = 219888954220.

The previous prime is 219888954127. The next prime is 219888954227. The reversal of 219888954221 is 122459888912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219464140900 + 424813321 = 468470^2 + 20611^2 .

It is a cyclic number.

It is not a de Polignac number, because 219888954221 - 2¹⁴ = 219888937837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (219888954227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109944477110 + 109944477111.

It is an arithmetic number, because the mean of its divisors is an integer number (109944477111).

Almost surely, 2^219888954221 is an apocalyptic number.

It is an amenable number.

219888954221 is a deficient number, since it is larger than the sum of its proper divisors (1).

219888954221 is an equidigital number, since it uses as much as digits as its factorization.

219888954221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6635520, while the sum is 59.

The spelling of 219888954221 in words is "two hundred nineteen billion, eight hundred eighty-eight million, nine hundred fifty-four thousand, two hundred twenty-one".