2111012110021 has 2 divisors, whose sum is σ = 2111012110022. Its totient is φ = 2111012110020.

The previous prime is 2111012110001. The next prime is 2111012110069. The reversal of 2111012110021 is 1200112101112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1212002828100 + 899009281921 = 1100910^2 + 948161^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111012110021 - 2³¹ = 2108864626373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2111012109983 and 2111012110010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111012110001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055506055010 + 1055506055011.

It is an arithmetic number, because the mean of its divisors is an integer number (1055506055011).

Almost surely, 2^{2111012110021} is an apocalyptic number.

It is an amenable number.

2111012110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111012110021 is an equidigital number, since it uses as much as digits as its factorization.

2111012110021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 2111012110021 its reverse (1200112101112), we get a palindrome (3311124211133).

The spelling of 2111012110021 in words is "two trillion, one hundred eleven billion, twelve million, one hundred ten thousand, twenty-one".