2121331033123 has 4 divisors (see below), whose sum is σ = 2246115211560. Its totient is φ = 1996546854688.

The previous prime is 2121331033103. The next prime is 2121331033139. The reversal of 2121331033123 is 3213301331212.

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 2121331033123 - 2²⁹ = 2120794162211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121331033103) 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, 62392089193 + ... + 62392089226.

It is an arithmetic number, because the mean of its divisors is an integer number (561528802890).

Almost surely, 2^{2121331033123} is an apocalyptic number.

2121331033123 is a deficient number, since it is larger than the sum of its proper divisors (124784178437).

2121331033123 is a wasteful number, since it uses less digits than its factorization.

2121331033123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124784178436.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 2121331033123 its reverse (3213301331212), we get a palindrome (5334632364335).

The spelling of 2121331033123 in words is "two trillion, one hundred twenty-one billion, three hundred thirty-one million, thirty-three thousand, one hundred twenty-three".