120021220021 has 4 divisors (see below), whose sum is σ = 120073473612. Its totient is φ = 119968966432.

The previous prime is 120021219979. The next prime is 120021220103. The reversal of 120021220021 is 120022120021.

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 89775140625 + 30246079396 = 299625^2 + 173914^2 .

It is a cyclic number.

It is not a de Polignac number, because 120021220021 - 2¹³ = 120021211829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120021219983 and 120021220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021220621) 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, 26123350 + ... + 26127943.

It is an arithmetic number, because the mean of its divisors is an integer number (30018368403).

Almost surely, 2^120021220021 is an apocalyptic number.

It is an amenable number.

120021220021 is a deficient number, since it is larger than the sum of its proper divisors (52253591).

120021220021 is an equidigital number, since it uses as much as digits as its factorization.

120021220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52253590.

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

Adding to 120021220021 its reverse (120022120021), we get a palindrome (240043340042).

The spelling of 120021220021 in words is "one hundred twenty billion, twenty-one million, two hundred twenty thousand, twenty-one".