120120202021 has 4 divisors (see below), whose sum is σ = 120220220044. Its totient is φ = 120020184000.

The previous prime is 120120202009. The next prime is 120120202061. The reversal of 120120202021 is 120202021021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4682664900 + 115437537121 = 68430^2 + 339761^2 .

It is a cyclic number.

It is not a de Polignac number, because 120120202021 - 2⁵ = 120120201989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120120201992 and 120120202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120120202061) 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 in 3 ways as a sum of consecutive naturals, for example, 50007210 + ... + 50009611.

It is an arithmetic number, because the mean of its divisors is an integer number (30055055011).

Almost surely, 2^120120202021 is an apocalyptic number.

It is an amenable number.

120120202021 is a deficient number, since it is larger than the sum of its proper divisors (100018023).

120120202021 is a wasteful number, since it uses less digits than its factorization.

120120202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100018022.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 120120202021 its reverse (120202021021), we get a palindrome (240322223042).

The spelling of 120120202021 in words is "one hundred twenty billion, one hundred twenty million, two hundred two thousand, twenty-one".