2121132423243 has 4 divisors (see below), whose sum is σ = 2828176564328. Its totient is φ = 1414088282160.

The previous prime is 2121132423239. The next prime is 2121132423259. The reversal of 2121132423243 is 3423242311212.

It is a happy number.

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

It is not a de Polignac number, because 2121132423243 - 2² = 2121132423239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2121132423243.

It is not an unprimeable number, because it can be changed into a prime (2121132423203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353522070538 + ... + 353522070543.

It is an arithmetic number, because the mean of its divisors is an integer number (707044141082).

Almost surely, 2^{2121132423243} is an apocalyptic number.

2121132423243 is a deficient number, since it is larger than the sum of its proper divisors (707044141085).

2121132423243 is an equidigital number, since it uses as much as digits as its factorization.

2121132423243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707044141084.

The product of its digits is 13824, while the sum is 30.

Adding to 2121132423243 its reverse (3423242311212), we get a palindrome (5544374734455).

The spelling of 2121132423243 in words is "two trillion, one hundred twenty-one billion, one hundred thirty-two million, four hundred twenty-three thousand, two hundred forty-three".