120212011721 has 2 divisors, whose sum is σ = 120212011722. Its totient is φ = 120212011720.

The previous prime is 120212011679. The next prime is 120212011723. The reversal of 120212011721 is 127110212021.

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., 120159289600 + 52722121 = 346640^2 + 7261^2 .

It is a cyclic number.

It is not a de Polignac number, because 120212011721 - 2¹⁸ = 120211749577 is a prime.

Together with 120212011723, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 120212011693 and 120212011702.

It is not a weakly prime, because it can be changed into another prime (120212011723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60106005860 + 60106005861.

It is an arithmetic number, because the mean of its divisors is an integer number (60106005861).

Almost surely, 2^120212011721 is an apocalyptic number.

It is an amenable number.

120212011721 is a deficient number, since it is larger than the sum of its proper divisors (1).

120212011721 is an equidigital number, since it uses as much as digits as its factorization.

120212011721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 120212011721 its reverse (127110212021), we get a palindrome (247322223742).

The spelling of 120212011721 in words is "one hundred twenty billion, two hundred twelve million, eleven thousand, seven hundred twenty-one".