21110011207 has 2 divisors, whose sum is σ = 21110011208. Its totient is φ = 21110011206.

The previous prime is 21110011189. The next prime is 21110011211. The reversal of 21110011207 is 70211001112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110011207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110011217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555005603 + 10555005604.

It is an arithmetic number, because the mean of its divisors is an integer number (10555005604).

Almost surely, 2^21110011207 is an apocalyptic number.

21110011207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110011207 is an equidigital number, since it uses as much as digits as its factorization.

21110011207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 16.

Adding to 21110011207 its reverse (70211001112), we get a palindrome (91321012319).

The spelling of 21110011207 in words is "twenty-one billion, one hundred ten million, eleven thousand, two hundred seven".