120000021 has 8 divisors (see below), whose sum is σ = 160958784. Its totient is φ = 79520640.

The previous prime is 120000007. The next prime is 120000031.

It is a happy number.

120000021 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 120000021 - 2¹³ = 119991829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 119999964 and 120000009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120000031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119260 + ... + 120261.

It is an arithmetic number, because the mean of its divisors is an integer number (20119848).

Almost surely, 2^120000021 is an apocalyptic number.

It is an amenable number.

120000021 is a deficient number, since it is larger than the sum of its proper divisors (40958763).

120000021 is a wasteful number, since it uses less digits than its factorization.

120000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239691.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 120000021 is about 10954.4521086178. The cubic root of 120000021 is about 493.2424436386.

It can be divided in two parts, 1200000 and 21, that added together give a palindrome (1200021).

The spelling of 120000021 in words is "one hundred twenty million, twenty-one", and thus it is an aban number.