21100122107 has 2 divisors, whose sum is σ = 21100122108. Its totient is φ = 21100122106.

The previous prime is 21100122097. The next prime is 21100122133. The reversal of 21100122107 is 70122100112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21100122107 - 2¹⁰ = 21100121083 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100122167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550061053 + 10550061054.

It is an arithmetic number, because the mean of its divisors is an integer number (10550061054).

Almost surely, 2^21100122107 is an apocalyptic number.

21100122107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100122107 is an equidigital number, since it uses as much as digits as its factorization.

21100122107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 21100122107 its reverse (70122100112), we get a palindrome (91222222219).

The spelling of 21100122107 in words is "twenty-one billion, one hundred million, one hundred twenty-two thousand, one hundred seven".