120210220021 has 4 divisors (see below), whose sum is σ = 127281409452. Its totient is φ = 113139030592.

The previous prime is 120210220007. The next prime is 120210220037. The reversal of 120210220021 is 120022012021.

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 109412100625 + 10798119396 = 330775^2 + 103914^2 .

It is a cyclic number.

It is not a de Polignac number, because 120210220021 - 2²¹ = 120208122869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120210219983 and 120210220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120210220001) 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, 3535594690 + ... + 3535594723.

It is an arithmetic number, because the mean of its divisors is an integer number (31820352363).

Almost surely, 2^120210220021 is an apocalyptic number.

It is an amenable number.

120210220021 is a deficient number, since it is larger than the sum of its proper divisors (7071189431).

120210220021 is an equidigital number, since it uses as much as digits as its factorization.

120210220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7071189430.

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

Adding to 120210220021 its reverse (120022012021), we get a palindrome (240232232042).

The spelling of 120210220021 in words is "one hundred twenty billion, two hundred ten million, two hundred twenty thousand, twenty-one".