2121090472 has 8 divisors (see below), whose sum is σ = 3977044650. Its totient is φ = 1060545232.

The previous prime is 2121090467. The next prime is 2121090487. The reversal of 2121090472 is 2740901212.

It can be written as a sum of positive squares in only one way, i.e., 2094526756 + 26563716 = 45766^2 + 5154^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 2121090472.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132568147 + ... + 132568162.

Almost surely, 2^2121090472 is an apocalyptic number.

It is an amenable number.

2121090472 is a deficient number, since it is larger than the sum of its proper divisors (1855954178).

2121090472 is a wasteful number, since it uses less digits than its factorization.

2121090472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265136315 (or 265136311 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 2121090472 is about 46055.2979797113. The cubic root of 2121090472 is about 1284.8518801549.

Adding to 2121090472 its reverse (2740901212), we get a palindrome (4861991684).

The spelling of 2121090472 in words is "two billion, one hundred twenty-one million, ninety thousand, four hundred seventy-two".