120120101021 has 4 divisors (see below), whose sum is σ = 124262173500. Its totient is φ = 115978028544.

The previous prime is 120120100979. The next prime is 120120101041. The reversal of 120120101021 is 120101021021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120101021021 = 213229 ⋅563249.

It can be written as a sum of positive squares in 2 ways, for example, as 99691116121 + 20428984900 = 315739^2 + 142930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120120101021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120120100993 and 120120101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120120101041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2071036196 + ... + 2071036253.

It is an arithmetic number, because the mean of its divisors is an integer number (31065543375).

Almost surely, 2^120120101021 is an apocalyptic number.

It is an amenable number.

120120101021 is a deficient number, since it is larger than the sum of its proper divisors (4142072479).

120120101021 is an equidigital number, since it uses as much as digits as its factorization.

120120101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4142072478.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 120120101021 its reverse (120101021021), we get a palindrome (240221122042).

The spelling of 120120101021 in words is "one hundred twenty billion, one hundred twenty million, one hundred one thousand, twenty-one".