2121438445 has 32 divisors (see below), whose sum is σ = 3066624000. Its totient is φ = 1376294976.

The previous prime is 2121438427. The next prime is 2121438457. The reversal of 2121438445 is 5448341212.

It is not a de Polignac number, because 2121438445 - 2⁵ = 2121438413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121438445.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 641406 + ... + 644704.

It is an arithmetic number, because the mean of its divisors is an integer number (95832000).

Almost surely, 2^2121438445 is an apocalyptic number.

It is an amenable number.

2121438445 is a deficient number, since it is larger than the sum of its proper divisors (945185555).

2121438445 is a wasteful number, since it uses less digits than its factorization.

2121438445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4297.

The product of its digits is 30720, while the sum is 34.

The square root of 2121438445 is about 46059.0755986266. The cubic root of 2121438445 is about 1284.9221379339.

Adding to 2121438445 its reverse (5448341212), we get a palindrome (7569779657).

The spelling of 2121438445 in words is "two billion, one hundred twenty-one million, four hundred thirty-eight thousand, four hundred forty-five".