21211111212107 has 2 divisors, whose sum is σ = 21211111212108. Its totient is φ = 21211111212106.

The previous prime is 21211111212091. The next prime is 21211111212133. The reversal of 21211111212107 is 70121211111212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21211111212107 - 2⁴ = 21211111212091 is a prime.

It is a super-2 number, since 2×21211111212107² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21211111212197) 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, 10605555606053 + 10605555606054.

It is an arithmetic number, because the mean of its divisors is an integer number (10605555606054).

Almost surely, 2^{21211111212107} is an apocalyptic number.

21211111212107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211111212107 is an equidigital number, since it uses as much as digits as its factorization.

21211111212107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 23.

Adding to 21211111212107 its reverse (70121211111212), we get a palindrome (91332322323319).

The spelling of 21211111212107 in words is "twenty-one trillion, two hundred eleven billion, one hundred eleven million, two hundred twelve thousand, one hundred seven".