2151202342123 has 4 divisors (see below), whose sum is σ = 2151217292368. Its totient is φ = 2151187391880.

The previous prime is 2151202342067. The next prime is 2151202342183. The reversal of 2151202342123 is 3212432021512.

It is a happy number.

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 2151202342123 - 2²¹ = 2151200244971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2151202342091 and 2151202342100.

It is not an unprimeable number, because it can be changed into a prime (2151202342183) 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, 7257168 + ... + 7547773.

It is an arithmetic number, because the mean of its divisors is an integer number (537804323092).

Almost surely, 2^{2151202342123} is an apocalyptic number.

2151202342123 is a deficient number, since it is larger than the sum of its proper divisors (14950245).

2151202342123 is a wasteful number, since it uses less digits than its factorization.

2151202342123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14950244.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 2151202342123 its reverse (3212432021512), we get a palindrome (5363634363635).

The spelling of 2151202342123 in words is "two trillion, one hundred fifty-one billion, two hundred two million, three hundred forty-two thousand, one hundred twenty-three".