2120134021 has 4 divisors (see below), whose sum is σ = 2120322112. Its totient is φ = 2119945932.

The previous prime is 2120134013. The next prime is 2120134033. The reversal of 2120134021 is 1204310212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2120134021 - 2³ = 2120134013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2120133986 and 2120134004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120134061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75981 + ... + 100066.

It is an arithmetic number, because the mean of its divisors is an integer number (530080528).

Almost surely, 2^2120134021 is an apocalyptic number.

It is an amenable number.

2120134021 is a deficient number, since it is larger than the sum of its proper divisors (188091).

2120134021 is a wasteful number, since it uses less digits than its factorization.

2120134021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188090.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2120134021 is about 46044.9130849435. The cubic root of 2120134021 is about 1284.6587275225.

Adding to 2120134021 its reverse (1204310212), we get a palindrome (3324444233).

The spelling of 2120134021 in words is "two billion, one hundred twenty million, one hundred thirty-four thousand, twenty-one".