120120000021 has 24 divisors (see below), whose sum is σ = 199299919104. Its totient is φ = 68291566560.

The previous prime is 120120000017. The next prime is 120120000083. The reversal of 120120000021 is 120000021021.

It is not a de Polignac number, because 120120000021 - 2² = 120120000017 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 120119999958 and 120120000012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120120000421) 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, 4826845 + ... + 4851666.

It is an arithmetic number, because the mean of its divisors is an integer number (8304163296).

Almost surely, 2^120120000021 is an apocalyptic number.

It is an amenable number.

120120000021 is a deficient number, since it is larger than the sum of its proper divisors (79179919083).

120120000021 is a wasteful number, since it uses less digits than its factorization.

120120000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9678721 (or 9678718 counting only the distinct ones).

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

Adding to 120120000021 its reverse (120000021021), we get a palindrome (240120021042).

The spelling of 120120000021 in words is "one hundred twenty billion, one hundred twenty million, twenty-one", and thus it is an aban number.