2121520163 has 4 divisors (see below), whose sum is σ = 2424594480. Its totient is φ = 1818445848.

The previous prime is 2121520153. The next prime is 2121520217. The reversal of 2121520163 is 3610251212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121520163 - 2⁴ = 2121520147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121520103) 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, 151537148 + ... + 151537161.

It is an arithmetic number, because the mean of its divisors is an integer number (606148620).

Almost surely, 2^2121520163 is an apocalyptic number.

2121520163 is a deficient number, since it is larger than the sum of its proper divisors (303074317).

2121520163 is an equidigital number, since it uses as much as digits as its factorization.

2121520163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303074316.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2121520163 is about 46059.9626899545. The cubic root of 2121520163 is about 1284.9386361609.

Adding to 2121520163 its reverse (3610251212), we get a palindrome (5731771375).

The spelling of 2121520163 in words is "two billion, one hundred twenty-one million, five hundred twenty thousand, one hundred sixty-three".