2121155003 has 16 divisors (see below), whose sum is σ = 2437958400. Its totient is φ = 1825195680.

The previous prime is 2121154999. The next prime is 2121155011. The reversal of 2121155003 is 3005511212.

It is a happy number.

It is not a de Polignac number, because 2121155003 - 2² = 2121154999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121155063) 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 15 ways as a sum of consecutive naturals, for example, 268433 + ... + 276221.

It is an arithmetic number, because the mean of its divisors is an integer number (152372400).

Almost surely, 2^2121155003 is an apocalyptic number.

2121155003 is a deficient number, since it is larger than the sum of its proper divisors (316803397).

2121155003 is a wasteful number, since it uses less digits than its factorization.

2121155003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9122.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2121155003 is about 46055.9985561056. The cubic root of 2121155003 is about 1284.8649099207.

Adding to 2121155003 its reverse (3005511212), we get a palindrome (5126666215).

The spelling of 2121155003 in words is "two billion, one hundred twenty-one million, one hundred fifty-five thousand, three".