21111322153 has 2 divisors, whose sum is σ = 21111322154. Its totient is φ = 21111322152.

The previous prime is 21111322151. The next prime is 21111322171. The reversal of 21111322153 is 35122311112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16764293529 + 4347028624 = 129477^2 + 65932^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111322153 - 2¹ = 21111322151 is a prime.

Together with 21111322151, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21111322151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555661076 + 10555661077.

It is an arithmetic number, because the mean of its divisors is an integer number (10555661077).

Almost surely, 2^21111322153 is an apocalyptic number.

It is an amenable number.

21111322153 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111322153 is an equidigital number, since it uses as much as digits as its factorization.

21111322153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 22.

Adding to 21111322153 its reverse (35122311112), we get a palindrome (56233633265).

The spelling of 21111322153 in words is "twenty-one billion, one hundred eleven million, three hundred twenty-two thousand, one hundred fifty-three".