21112120307 has 2 divisors, whose sum is σ = 21112120308. Its totient is φ = 21112120306.

The previous prime is 21112120277. The next prime is 21112120331. The reversal of 21112120307 is 70302121112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21112120307 - 2⁶ = 21112120243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21112620307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556060153 + 10556060154.

It is an arithmetic number, because the mean of its divisors is an integer number (10556060154).

Almost surely, 2^21112120307 is an apocalyptic number.

21112120307 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112120307 is an equidigital number, since it uses as much as digits as its factorization.

21112120307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 21112120307 its reverse (70302121112), we get a palindrome (91414241419).

The spelling of 21112120307 in words is "twenty-one billion, one hundred twelve million, one hundred twenty thousand, three hundred seven".