2145121116 has 12 divisors (see below), whose sum is σ = 5005282632. Its totient is φ = 715040368.

The previous prime is 2145121087. The next prime is 2145121117. The reversal of 2145121116 is 6111215412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145121117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89380035 + ... + 89380058.

It is an arithmetic number, because the mean of its divisors is an integer number (417106886).

Almost surely, 2^2145121116 is an apocalyptic number.

It is an amenable number.

2145121116 is an abundant number, since it is smaller than the sum of its proper divisors (2860161516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145121116 is a wasteful number, since it uses less digits than its factorization.

2145121116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178760100 (or 178760098 counting only the distinct ones).

The product of its digits is 480, while the sum is 24.

The square root of 2145121116 is about 46315.4522378871. The cubic root of 2145121116 is about 1289.6858630554.

Adding to 2145121116 its reverse (6111215412), we get a palindrome (8256336528).

The spelling of 2145121116 in words is "two billion, one hundred forty-five million, one hundred twenty-one thousand, one hundred sixteen".