2113203121 has 8 divisors (see below), whose sum is σ = 2154090024. Its totient is φ = 2072353920.

The previous prime is 2113203107. The next prime is 2113203149. The reversal of 2113203121 is 1213023112.

It can be written as a sum of positive squares in 4 ways, for example, as 913550625 + 1199652496 = 30225^2 + 34636^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2113203121 is a prime.

It is a super-3 number, since 3×2113203121³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2113203095 and 2113203104.

It is not an unprimeable number, because it can be changed into a prime (2113203151) 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, 120981 + ... + 137341.

It is an arithmetic number, because the mean of its divisors is an integer number (269261253).

Almost surely, 2^2113203121 is an apocalyptic number.

It is an amenable number.

2113203121 is a deficient number, since it is larger than the sum of its proper divisors (40886903).

2113203121 is a wasteful number, since it uses less digits than its factorization.

2113203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18851.

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

The square root of 2113203121 is about 45969.5890888748. The cubic root of 2113203121 is about 1283.2573127660.

Adding to 2113203121 its reverse (1213023112), we get a palindrome (3326226233).

Subtracting from 2113203121 its reverse (1213023112), we obtain a square (900180009 = 30003²).

The spelling of 2113203121 in words is "two billion, one hundred thirteen million, two hundred three thousand, one hundred twenty-one".