120202120021 has 4 divisors (see below), whose sum is σ = 120202814700. Its totient is φ = 120201425344.

The previous prime is 120202119949. The next prime is 120202120057. The reversal of 120202120021 is 120021202021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9788134225 + 110413985796 = 98935^2 + 332286^2 .

It is a cyclic number.

It is not a de Polignac number, because 120202120021 - 2³¹ = 118054636373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120202119983 and 120202120010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120202120721) 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, 142125 + ... + 510493.

It is an arithmetic number, because the mean of its divisors is an integer number (30050703675).

Almost surely, 2^120202120021 is an apocalyptic number.

It is an amenable number.

120202120021 is a deficient number, since it is larger than the sum of its proper divisors (694679).

120202120021 is an equidigital number, since it uses as much as digits as its factorization.

120202120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694678.

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

Adding to 120202120021 its reverse (120021202021), we get a palindrome (240223322042).

The spelling of 120202120021 in words is "one hundred twenty billion, two hundred two million, one hundred twenty thousand, twenty-one".