120420021 has 16 divisors (see below), whose sum is σ = 162134208. Its totient is φ = 79497600.

The previous prime is 120419989. The next prime is 120420029. The reversal of 120420021 is 120024021.

It is not a de Polignac number, because 120420021 - 2⁵ = 120419989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 120419979 and 120420006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120420029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177535 + ... + 178211.

It is an arithmetic number, because the mean of its divisors is an integer number (10133388).

Almost surely, 2^120420021 is an apocalyptic number.

It is an amenable number.

120420021 is a deficient number, since it is larger than the sum of its proper divisors (41714187).

120420021 is a wasteful number, since it uses less digits than its factorization.

120420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1172.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 120420021 is about 10973.6056517446. The cubic root of 120420021 is about 493.8172230003.

Adding to 120420021 its reverse (120024021), we get a palindrome (240444042).

The spelling of 120420021 in words is "one hundred twenty million, four hundred twenty thousand, twenty-one".