120721955 has 4 divisors (see below), whose sum is σ = 144866352. Its totient is φ = 96577560.

The previous prime is 120721921. The next prime is 120721973. The reversal of 120721955 is 559127021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 559127021 = 10427 ⋅53623.

It is not a de Polignac number, because 120721955 - 2¹² = 120717859 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12072191 + ... + 12072200.

It is an arithmetic number, because the mean of its divisors is an integer number (36216588).

Almost surely, 2^120721955 is an apocalyptic number.

120721955 is a deficient number, since it is larger than the sum of its proper divisors (24144397).

120721955 is an equidigital number, since it uses as much as digits as its factorization.

120721955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24144396.

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 120721955 is about 10987.3543221287. The cubic root of 120721955 is about 494.2296011814.

Adding to 120721955 its reverse (559127021), we get a palindrome (679848976).

The spelling of 120721955 in words is "one hundred twenty million, seven hundred twenty-one thousand, nine hundred fifty-five".