2145121010 has 16 divisors (see below), whose sum is σ = 3994363800. Its totient is φ = 828460416.

The previous prime is 2145121009. The next prime is 2145121019. The reversal of 2145121010 is 101215412.

It can be written as a sum of positive squares in 4 ways, for example, as 2106718201 + 38402809 = 45899^2 + 6197^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2145121010.

It is not an unprimeable number, because it can be changed into a prime (2145121019) 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 7 ways as a sum of consecutive naturals, for example, 3698195 + ... + 3698774.

Almost surely, 2^2145121010 is an apocalyptic number.

2145121010 is a deficient number, since it is larger than the sum of its proper divisors (1849242790).

2145121010 is a wasteful number, since it uses less digits than its factorization.

2145121010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7397005.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 2145121010 is about 46315.4510935606. The cubic root of 2145121010 is about 1289.6858418124.

Adding to 2145121010 its reverse (101215412), we get a palindrome (2246336422).

The spelling of 2145121010 in words is "two billion, one hundred forty-five million, one hundred twenty-one thousand, ten".