2120120120021 has 2 divisors, whose sum is σ = 2120120120022. Its totient is φ = 2120120120020.

The previous prime is 2120120120009. The next prime is 2120120120033. The reversal of 2120120120021 is 1200210210212.

It is a balanced prime because it is at equal distance from previous prime (2120120120009) and next prime (2120120120033).

It can be written as a sum of positive squares in only one way, i.e., 2046888183025 + 73231936996 = 1430695^2 + 270614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120120120021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2120120119978 and 2120120120005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120120129021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060060060010 + 1060060060011.

It is an arithmetic number, because the mean of its divisors is an integer number (1060060060011).

Almost surely, 2^{2120120120021} is an apocalyptic number.

It is an amenable number.

2120120120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120120120021 is an equidigital number, since it uses as much as digits as its factorization.

2120120120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2120120120021 its reverse (1200210210212), we get a palindrome (3320330330233).

The spelling of 2120120120021 in words is "two trillion, one hundred twenty billion, one hundred twenty million, one hundred twenty thousand, twenty-one".