2123256155 has 8 divisors (see below), whose sum is σ = 2658686112. Its totient is φ = 1624752448.

The previous prime is 2123256143. The next prime is 2123256167. The reversal of 2123256155 is 5516523212.

It is an interprime number because it is at equal distance from previous prime (2123256143) and next prime (2123256167).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2123256155 - 2⁴ = 2123256139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9231434 + ... + 9231663.

It is an arithmetic number, because the mean of its divisors is an integer number (332335764).

Almost surely, 2^2123256155 is an apocalyptic number.

2123256155 is a deficient number, since it is larger than the sum of its proper divisors (535429957).

2123256155 is a wasteful number, since it uses less digits than its factorization.

2123256155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18463125.

The product of its digits is 18000, while the sum is 32.

The square root of 2123256155 is about 46078.8037496635. The cubic root of 2123256155 is about 1285.2890193562.

Adding to 2123256155 its reverse (5516523212), we get a palindrome (7639779367).

The spelling of 2123256155 in words is "two billion, one hundred twenty-three million, two hundred fifty-six thousand, one hundred fifty-five".