2121145523 has 4 divisors (see below), whose sum is σ = 2424166320. Its totient is φ = 1818124728.

The previous prime is 2121145513. The next prime is 2121145531. The reversal of 2121145523 is 3255411212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2121145523 - 2⁶ = 2121145459 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121145492 and 2121145501.

It is not an unprimeable number, because it can be changed into a prime (2121145513) 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, 151510388 + ... + 151510401.

It is an arithmetic number, because the mean of its divisors is an integer number (606041580).

Almost surely, 2^2121145523 is an apocalyptic number.

2121145523 is a deficient number, since it is larger than the sum of its proper divisors (303020797).

2121145523 is an equidigital number, since it uses as much as digits as its factorization.

2121145523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303020796.

The product of its digits is 2400, while the sum is 26.

The square root of 2121145523 is about 46055.8956378008. The cubic root of 2121145523 is about 1284.8629957847.

Adding to 2121145523 its reverse (3255411212), we get a palindrome (5376556735).

The spelling of 2121145523 in words is "two billion, one hundred twenty-one million, one hundred forty-five thousand, five hundred twenty-three".