2135204123 has 4 divisors (see below), whose sum is σ = 2299450608. Its totient is φ = 1970957640.

The previous prime is 2135204119. The next prime is 2135204129. The reversal of 2135204123 is 3214025312.

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

It is a cyclic number.

It is not a de Polignac number, because 2135204123 - 2² = 2135204119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2135204129) 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, 82123223 + ... + 82123248.

It is an arithmetic number, because the mean of its divisors is an integer number (574862652).

Almost surely, 2^2135204123 is an apocalyptic number.

2135204123 is a deficient number, since it is larger than the sum of its proper divisors (164246485).

2135204123 is a wasteful number, since it uses less digits than its factorization.

2135204123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164246484.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 2135204123 is about 46208.2689894352. The cubic root of 2135204123 is about 1287.6953669411.

Adding to 2135204123 its reverse (3214025312), we get a palindrome (5349229435).

The spelling of 2135204123 in words is "two billion, one hundred thirty-five million, two hundred four thousand, one hundred twenty-three".