2113312021 has 4 divisors (see below), whose sum is σ = 2125966752. Its totient is φ = 2100657292.

The previous prime is 2113312001. The next prime is 2113312037. The reversal of 2113312021 is 1202133112.

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 2113312021 - 2¹¹ = 2113309973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2113311986 and 2113312004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113312001) 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, 6327115 + ... + 6327448.

It is an arithmetic number, because the mean of its divisors is an integer number (531491688).

Almost surely, 2^2113312021 is an apocalyptic number.

It is an amenable number.

2113312021 is a deficient number, since it is larger than the sum of its proper divisors (12654731).

2113312021 is a wasteful number, since it uses less digits than its factorization.

2113312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12654730.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2113312021 is about 45970.7735523343. The cubic root of 2113312021 is about 1283.2793558152.

Adding to 2113312021 its reverse (1202133112), we get a palindrome (3315445133).

The spelling of 2113312021 in words is "two billion, one hundred thirteen million, three hundred twelve thousand, twenty-one".