2121123130021 has 8 divisors (see below), whose sum is σ = 2430372447360. Its totient is φ = 1813431744528.

The previous prime is 2121123129997. The next prime is 2121123130037. The reversal of 2121123130021 is 1200313211212.

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 2121123130021 - 2¹⁷ = 2121122998949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121123130421) 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, 389480041 + ... + 389485486.

It is an arithmetic number, because the mean of its divisors is an integer number (303796555920).

Almost surely, 2^{2121123130021} is an apocalyptic number.

It is an amenable number.

2121123130021 is a deficient number, since it is larger than the sum of its proper divisors (309249317339).

2121123130021 is an equidigital number, since it uses as much as digits as its factorization.

2121123130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778965923.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2121123130021 its reverse (1200313211212), we get a palindrome (3321436341233).

The spelling of 2121123130021 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-three million, one hundred thirty thousand, twenty-one".