21112122102251 has 2 divisors, whose sum is σ = 21112122102252. Its totient is φ = 21112122102250.

The previous prime is 21112122102139. The next prime is 21112122102307. The reversal of 21112122102251 is 15220122121112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112122102251 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112122102551) 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, 10556061051125 + 10556061051126.

It is an arithmetic number, because the mean of its divisors is an integer number (10556061051126).

Almost surely, 2^{21112122102251} is an apocalyptic number.

21112122102251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112122102251 is an equidigital number, since it uses as much as digits as its factorization.

21112122102251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 320, while the sum is 23.

Adding to 21112122102251 its reverse (15220122121112), we get a palindrome (36332244223363).

The spelling of 21112122102251 in words is "twenty-one trillion, one hundred twelve billion, one hundred twenty-two million, one hundred two thousand, two hundred fifty-one".