2121155012 has 24 divisors (see below), whose sum is σ = 3759789600. Its totient is φ = 1047015936.

The previous prime is 2121155011. The next prime is 2121155021. The reversal of 2121155012 is 2105511212.

It is not an unprimeable number, because it can be changed into a prime (2121155011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88868 + ... + 110180.

It is an arithmetic number, because the mean of its divisors is an integer number (156657900).

Almost surely, 2^2121155012 is an apocalyptic number.

It is an amenable number.

2121155012 is a deficient number, since it is larger than the sum of its proper divisors (1638634588).

2121155012 is a wasteful number, since it uses less digits than its factorization.

2121155012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21635 (or 21633 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 2121155012 is about 46055.9986538127. The cubic root of 2121155012 is about 1284.8649117379.

Adding to 2121155012 its reverse (2105511212), we get a palindrome (4226666224).

The spelling of 2121155012 in words is "two billion, one hundred twenty-one million, one hundred fifty-five thousand, twelve".