120021255 has 24 divisors (see below), whose sum is σ = 209886768. Its totient is φ = 63442176.

The previous prime is 120021211. The next prime is 120021257. The reversal of 120021255 is 552120021.

It is not a de Polignac number, because 120021255 - 2⁶ = 120021191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120021257) 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 23 ways as a sum of consecutive naturals, for example, 6717 + ... + 16886.

It is an arithmetic number, because the mean of its divisors is an integer number (8745282).

Almost surely, 2^120021255 is an apocalyptic number.

120021255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

120021255 is a deficient number, since it is larger than the sum of its proper divisors (89865513).

120021255 is a wasteful number, since it uses less digits than its factorization.

120021255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23727 (or 23724 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 120021255 is about 10955.4212607275. The cubic root of 120021255 is about 493.2715350011.

Adding to 120021255 its reverse (552120021), we get a palindrome (672141276).

The spelling of 120021255 in words is "one hundred twenty million, twenty-one thousand, two hundred fifty-five".