2113121021 has 8 divisors (see below), whose sum is σ = 2405450304. Its totient is φ = 1837496320.

The previous prime is 2113120963. The next prime is 2113121027. The reversal of 2113121021 is 1201213112.

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

It is not a de Polignac number, because 2113121021 - 2¹⁸ = 2112858877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2113120987 and 2113121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113121027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4175876 + ... + 4176381.

It is an arithmetic number, because the mean of its divisors is an integer number (300681288).

Almost surely, 2^2113121021 is an apocalyptic number.

It is an amenable number.

2113121021 is a deficient number, since it is larger than the sum of its proper divisors (292329283).

2113121021 is a wasteful number, since it uses less digits than its factorization.

2113121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8352291.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 2113121021 is about 45968.6960985408. The cubic root of 2113121021 is about 1283.2406939519.

Adding to 2113121021 its reverse (1201213112), we get a palindrome (3314334133).

The spelling of 2113121021 in words is "two billion, one hundred thirteen million, one hundred twenty-one thousand, twenty-one".