21222111221959 has 2 divisors, whose sum is σ = 21222111221960. Its totient is φ = 21222111221958.

The previous prime is 21222111221929. The next prime is 21222111222019. The reversal of 21222111221959 is 95912211122212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21222111221959 - 2¹³ = 21222111213767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222111221929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611055610979 + 10611055610980.

It is an arithmetic number, because the mean of its divisors is an integer number (10611055610980).

Almost surely, 2^{21222111221959} is an apocalyptic number.

21222111221959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222111221959 is an equidigital number, since it uses as much as digits as its factorization.

21222111221959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 40.

The spelling of 21222111221959 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, two hundred twenty-one thousand, nine hundred fifty-nine".