2102113121 has 4 divisors (see below), whose sum is σ = 2225766852. Its totient is φ = 1978459392.

The previous prime is 2102113103. The next prime is 2102113151. The reversal of 2102113121 is 1213112012.

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 1062760000 + 1039353121 = 32600^2 + 32239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2102113121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2102113096 and 2102113105.

It is not an unprimeable number, because it can be changed into a prime (2102113151) 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, 61826840 + ... + 61826873.

It is an arithmetic number, because the mean of its divisors is an integer number (556441713).

Almost surely, 2^2102113121 is an apocalyptic number.

It is an amenable number.

2102113121 is a deficient number, since it is larger than the sum of its proper divisors (123653731).

2102113121 is a wasteful number, since it uses less digits than its factorization.

2102113121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123653730.

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

The square root of 2102113121 is about 45848.8071927722. The cubic root of 2102113121 is about 1281.0085477797.

Adding to 2102113121 its reverse (1213112012), we get a palindrome (3315225133).

The spelling of 2102113121 in words is "two billion, one hundred two million, one hundred thirteen thousand, one hundred twenty-one".