2121113153 has 4 divisors (see below), whose sum is σ = 2213335488. Its totient is φ = 2028890820.

The previous prime is 2121113131. The next prime is 2121113177. The reversal of 2121113153 is 3513111212.

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 2121113153 - 2²⁶ = 2054004289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121113653) 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, 46111133 + ... + 46111178.

It is an arithmetic number, because the mean of its divisors is an integer number (553333872).

Almost surely, 2^2121113153 is an apocalyptic number.

2121113153 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2121113153 is a deficient number, since it is larger than the sum of its proper divisors (92222335).

2121113153 is an equidigital number, since it uses as much as digits as its factorization.

2121113153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92222334.

The product of its digits is 180, while the sum is 20.

The square root of 2121113153 is about 46055.5442156533. The cubic root of 2121113153 is about 1284.8564598153.

Adding to 2121113153 its reverse (3513111212), we get a palindrome (5634224365).

The spelling of 2121113153 in words is "two billion, one hundred twenty-one million, one hundred thirteen thousand, one hundred fifty-three".