2155202123 has 8 divisors (see below), whose sum is σ = 2196611136. Its totient is φ = 2113820800.

The previous prime is 2155202117. The next prime is 2155202177. The reversal of 2155202123 is 3212025512.

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 2155202123 - 2⁴ = 2155202107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155202723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221603 + ... + 231123.

It is an arithmetic number, because the mean of its divisors is an integer number (274576392).

Almost surely, 2^2155202123 is an apocalyptic number.

2155202123 is a deficient number, since it is larger than the sum of its proper divisors (41409013).

2155202123 is an equidigital number, since it uses as much as digits as its factorization.

2155202123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13845.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2155202123 is about 46424.1545211111. The cubic root of 2155202123 is about 1291.7030014688.

Adding to 2155202123 its reverse (3212025512), we get a palindrome (5367227635).

The spelling of 2155202123 in words is "two billion, one hundred fifty-five million, two hundred two thousand, one hundred twenty-three".