21000111112207 has 2 divisors, whose sum is σ = 21000111112208. Its totient is φ = 21000111112206.

The previous prime is 21000111112199. The next prime is 21000111112213. The reversal of 21000111112207 is 70221111100012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000111112207 - 2³ = 21000111112199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000111113207) 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, 10500055556103 + 10500055556104.

It is an arithmetic number, because the mean of its divisors is an integer number (10500055556104).

Almost surely, 2^{21000111112207} is an apocalyptic number.

21000111112207 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000111112207 is an equidigital number, since it uses as much as digits as its factorization.

21000111112207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 21000111112207 its reverse (70221111100012), we get a palindrome (91221222212219).

The spelling of 21000111112207 in words is "twenty-one trillion, one hundred eleven million, one hundred twelve thousand, two hundred seven".