2130111042421 has 4 divisors (see below), whose sum is σ = 2130506905644. Its totient is φ = 2129715179200.

The previous prime is 2130111042403. The next prime is 2130111042431. The reversal of 2130111042421 is 1242401110312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 915056775396 + 1215054267025 = 956586^2 + 1102295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2130111042421 - 2⁹ = 2130111041909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2130111042392 and 2130111042401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2130111042431) 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, 197923540 + ... + 197934301.

It is an arithmetic number, because the mean of its divisors is an integer number (532626726411).

Almost surely, 2^{2130111042421} is an apocalyptic number.

It is an amenable number.

2130111042421 is a deficient number, since it is larger than the sum of its proper divisors (395863223).

2130111042421 is an equidigital number, since it uses as much as digits as its factorization.

2130111042421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395863222.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 2130111042421 its reverse (1242401110312), we get a palindrome (3372512152733).

The spelling of 2130111042421 in words is "two trillion, one hundred thirty billion, one hundred eleven million, forty-two thousand, four hundred twenty-one".