2121003124405 has 8 divisors (see below), whose sum is σ = 2776585908384. Its totient is φ = 1542547726800.

The previous prime is 2121003124367. The next prime is 2121003124411. The reversal of 2121003124405 is 5044213001212.

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

It is not a de Polignac number, because 2121003124405 - 2⁹ = 2121003123893 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 2121003124405.

It is a congruent 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, 19281846531 + ... + 19281846640.

It is an arithmetic number, because the mean of its divisors is an integer number (347073238548).

Almost surely, 2^{2121003124405} is an apocalyptic number.

It is an amenable number.

2121003124405 is a deficient number, since it is larger than the sum of its proper divisors (655582783979).

2121003124405 is a wasteful number, since it uses less digits than its factorization.

2121003124405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38563693187.

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 2121003124405 its reverse (5044213001212), we get a palindrome (7165216125617).

The spelling of 2121003124405 in words is "two trillion, one hundred twenty-one billion, three million, one hundred twenty-four thousand, four hundred five".