20121143255 has 4 divisors (see below), whose sum is σ = 24145371912. Its totient is φ = 16096914600.

The previous prime is 20121143243. The next prime is 20121143267. The reversal of 20121143255 is 55234112102.

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

It is an interprime number because it is at equal distance from previous prime (20121143243) and next prime (20121143267).

It is not a de Polignac number, because 20121143255 - 2⁴ = 20121143239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2012114321 + ... + 2012114330.

It is an arithmetic number, because the mean of its divisors is an integer number (6036342978).

Almost surely, 2^20121143255 is an apocalyptic number.

20121143255 is a deficient number, since it is larger than the sum of its proper divisors (4024228657).

20121143255 is an equidigital number, since it uses as much as digits as its factorization.

20121143255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024228656.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 20121143255 its reverse (55234112102), we get a palindrome (75355255357).

The spelling of 20121143255 in words is "twenty billion, one hundred twenty-one million, one hundred forty-three thousand, two hundred fifty-five".