21012220111007 has 2 divisors, whose sum is σ = 21012220111008. Its totient is φ = 21012220111006.

The previous prime is 21012220110949. The next prime is 21012220111151. The reversal of 21012220111007 is 70011102221012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21012220111007 - 2⁸ = 21012220110751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21012220111007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012220111507) 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, 10506110055503 + 10506110055504.

It is an arithmetic number, because the mean of its divisors is an integer number (10506110055504).

Almost surely, 2^{21012220111007} is an apocalyptic number.

21012220111007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012220111007 is an equidigital number, since it uses as much as digits as its factorization.

21012220111007 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 20.

Adding to 21012220111007 its reverse (70011102221012), we get a palindrome (91023322332019).

The spelling of 21012220111007 in words is "twenty-one trillion, twelve billion, two hundred twenty million, one hundred eleven thousand, seven".