21122222783 has 2 divisors, whose sum is σ = 21122222784. Its totient is φ = 21122222782.

The previous prime is 21122222749. The next prime is 21122222791. The reversal of 21122222783 is 38722222112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21122222783 is a prime.

It is a super-2 number, since 2×21122222783² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21122222083) 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 as a sum of consecutive naturals, namely, 10561111391 + 10561111392.

It is an arithmetic number, because the mean of its divisors is an integer number (10561111392).

Almost surely, 2^21122222783 is an apocalyptic number.

21122222783 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122222783 is an equidigital number, since it uses as much as digits as its factorization.

21122222783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 32.

Adding to 21122222783 its reverse (38722222112), we get a palindrome (59844444895).

The spelling of 21122222783 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-two thousand, seven hundred eighty-three".