120115121255 has 4 divisors (see below), whose sum is σ = 144138145512. Its totient is φ = 96092097000.

The previous prime is 120115121251. The next prime is 120115121281. The reversal of 120115121255 is 552121511021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 120115121255 - 2² = 120115121251 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120115121251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12011512121 + ... + 12011512130.

It is an arithmetic number, because the mean of its divisors is an integer number (36034536378).

Almost surely, 2^120115121255 is an apocalyptic number.

120115121255 is a deficient number, since it is larger than the sum of its proper divisors (24023024257).

120115121255 is an equidigital number, since it uses as much as digits as its factorization.

120115121255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24023024256.

The product of its (nonzero) digits is 1000, while the sum is 26.

Adding to 120115121255 its reverse (552121511021), we get a palindrome (672236632276).

The spelling of 120115121255 in words is "one hundred twenty billion, one hundred fifteen million, one hundred twenty-one thousand, two hundred fifty-five".