2120111101021 has 2 divisors, whose sum is σ = 2120111101022. Its totient is φ = 2120111101020.

The previous prime is 2120111100977. The next prime is 2120111101027. The reversal of 2120111101021 is 1201011110212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2040355128100 + 79755972921 = 1428410^2 + 282411^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120111101021 - 2⁷ = 2120111100893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120111100992 and 2120111101010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120111101027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060055550510 + 1060055550511.

It is an arithmetic number, because the mean of its divisors is an integer number (1060055550511).

Almost surely, 2^{2120111101021} is an apocalyptic number.

It is an amenable number.

2120111101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120111101021 is an equidigital number, since it uses as much as digits as its factorization.

2120111101021 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 2120111101021 its reverse (1201011110212), we get a palindrome (3321122211233).

The spelling of 2120111101021 in words is "two trillion, one hundred twenty billion, one hundred eleven million, one hundred one thousand, twenty-one".