211103120021 has 2 divisors, whose sum is σ = 211103120022. Its totient is φ = 211103120020.

The previous prime is 211103119993. The next prime is 211103120147. The reversal of 211103120021 is 120021301112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184823467921 + 26279652100 = 429911^2 + 162110^2 .

It is a cyclic number.

It is not a de Polignac number, because 211103120021 - 2¹⁸ = 211102857877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211103119978 and 211103120005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211103120321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105551560010 + 105551560011.

It is an arithmetic number, because the mean of its divisors is an integer number (105551560011).

Almost surely, 2^211103120021 is an apocalyptic number.

It is an amenable number.

211103120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

211103120021 is an equidigital number, since it uses as much as digits as its factorization.

211103120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 211103120021 its reverse (120021301112), we get a palindrome (331124421133).

The spelling of 211103120021 in words is "two hundred eleven billion, one hundred three million, one hundred twenty thousand, twenty-one".