120010020021 has 24 divisors (see below), whose sum is σ = 176986759040. Its totient is φ = 78342935616.

The previous prime is 120010020001. The next prime is 120010020047. The reversal of 120010020021 is 120020010021.

It is not a de Polignac number, because 120010020021 - 2⁶ = 120010019957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120010019985 and 120010020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120010020001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 565741 + ... + 748386.

Almost surely, 2^120010020021 is an apocalyptic number.

It is an amenable number.

120010020021 is a deficient number, since it is larger than the sum of its proper divisors (56976739019).

120010020021 is a wasteful number, since it uses less digits than its factorization.

120010020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314345 (or 1314342 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 120010020021 its reverse (120020010021), we get a palindrome (240030030042).

The spelling of 120010020021 in words is "one hundred twenty billion, ten million, twenty thousand, twenty-one".