2130121021 has 8 divisors (see below), whose sum is σ = 2518369920. Its totient is φ = 1762858608.

The previous prime is 2130121013. The next prime is 2130121051. The reversal of 2130121021 is 1201210312.

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

It is not a de Polignac number, because 2130121021 - 2³ = 2130121013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2130120992 and 2130121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2130121051) 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, 5246401 + ... + 5246806.

It is an arithmetic number, because the mean of its divisors is an integer number (314796240).

Almost surely, 2^2130121021 is an apocalyptic number.

It is an amenable number.

2130121021 is a deficient number, since it is larger than the sum of its proper divisors (388248899).

2130121021 is a wasteful number, since it uses less digits than its factorization.

2130121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10493243.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2130121021 is about 46153.2341336986. The cubic root of 2130121021 is about 1286.6727187544.

Adding to 2130121021 its reverse (1201210312), we get a palindrome (3331331333).

The spelling of 2130121021 in words is "two billion, one hundred thirty million, one hundred twenty-one thousand, twenty-one".