2121123202121 has 8 divisors (see below), whose sum is σ = 2644517239104. Its totient is φ = 1652823274320.

The previous prime is 2121123202117. The next prime is 2121123202153. The reversal of 2121123202121 is 1212023211212.

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 2121123202121 - 2² = 2121123202117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121123202093 and 2121123202102.

It is not an unprimeable number, because it can be changed into a prime (2121123202721) 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, 13773527210 + ... + 13773527363.

It is an arithmetic number, because the mean of its divisors is an integer number (330564654888).

Almost surely, 2^{2121123202121} is an apocalyptic number.

It is an amenable number.

2121123202121 is a deficient number, since it is larger than the sum of its proper divisors (523394036983).

2121123202121 is a wasteful number, since it uses less digits than its factorization.

2121123202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27547054591.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 2121123202121 its reverse (1212023211212), we get a palindrome (3333146413333).

Subtracting from 2121123202121 its reverse (1212023211212), we obtain a palindrome (909099990909).

The spelling of 2121123202121 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, two hundred two thousand, one hundred twenty-one".