21222111221983 has 4 divisors (see below), whose sum is σ = 24253841396560. Its totient is φ = 18190381047408.

The previous prime is 21222111221959. The next prime is 21222111222019. The reversal of 21222111221983 is 38912211122212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222111221983 - 2²¹ = 21222109124831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222111221783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515865087278 + ... + 1515865087291.

It is an arithmetic number, because the mean of its divisors is an integer number (6063460349140).

Almost surely, 2^{21222111221983} is an apocalyptic number.

21222111221983 is a deficient number, since it is larger than the sum of its proper divisors (3031730174577).

21222111221983 is an equidigital number, since it uses as much as digits as its factorization.

21222111221983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031730174576.

The product of its digits is 13824, while the sum is 37.

The spelling of 21222111221983 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, two hundred twenty-one thousand, nine hundred eighty-three".