120211021020721 has 2 divisors, whose sum is σ = 120211021020722. Its totient is φ = 120211021020720.

The previous prime is 120211021020719. The next prime is 120211021020749. The reversal of 120211021020721 is 127020120112021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63110933289121 + 57100087731600 = 7944239^2 + 7556460^2 .

It is a cyclic number.

It is not a de Polignac number, because 120211021020721 - 2¹ = 120211021020719 is a prime.

It is a super-2 number, since 2×120211021020721² (a number of 29 digits) contains 22 as substring.

Together with 120211021020719, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 120211021020692 and 120211021020701.

It is not a weakly prime, because it can be changed into another prime (120211081020721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60105510510360 + 60105510510361.

It is an arithmetic number, because the mean of its divisors is an integer number (60105510510361).

Almost surely, 2^{120211021020721} is an apocalyptic number.

It is an amenable number.

120211021020721 is a deficient number, since it is larger than the sum of its proper divisors (1).

120211021020721 is an equidigital number, since it uses as much as digits as its factorization.

120211021020721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 120211021020721 its reverse (127020120112021), we get a palindrome (247231141132742).

The spelling of 120211021020721 in words is "one hundred twenty trillion, two hundred eleven billion, twenty-one million, twenty thousand, seven hundred twenty-one".