12120211010021 has 2 divisors, whose sum is σ = 12120211010022. Its totient is φ = 12120211010020.

The previous prime is 12120211009939. The next prime is 12120211010029. The reversal of 12120211010021 is 12001011202121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10337414584225 + 1782796425796 = 3215185^2 + 1335214^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12120211010021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12120211009978 and 12120211010005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12120211010029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060105505010 + 6060105505011.

It is an arithmetic number, because the mean of its divisors is an integer number (6060105505011).

Almost surely, 2^{12120211010021} is an apocalyptic number.

It is an amenable number.

12120211010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120211010021 is an equidigital number, since it uses as much as digits as its factorization.

12120211010021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 12120211010021 its reverse (12001011202121), we get a palindrome (24121222212142).

The spelling of 12120211010021 in words is "twelve trillion, one hundred twenty billion, two hundred eleven million, ten thousand, twenty-one".