20111221219 has 2 divisors, whose sum is σ = 20111221220. Its totient is φ = 20111221218.

The previous prime is 20111221199. The next prime is 20111221237. The reversal of 20111221219 is 91212211102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111221219 - 2¹¹ = 20111219171 is a prime.

It is a super-2 number, since 2×20111221219² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20111221219.

It is not a weakly prime, because it can be changed into another prime (20111221279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055610609 + 10055610610.

It is an arithmetic number, because the mean of its divisors is an integer number (10055610610).

Almost surely, 2^20111221219 is an apocalyptic number.

20111221219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111221219 is an equidigital number, since it uses as much as digits as its factorization.

20111221219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 20111221219 in words is "twenty billion, one hundred eleven million, two hundred twenty-one thousand, two hundred nineteen".