2121067216 has 20 divisors (see below), whose sum is σ = 4121772772. Its totient is φ = 1057383936.

The previous prime is 2121067189. The next prime is 2121067219. The reversal of 2121067216 is 6127601212.

It can be written as a sum of positive squares in 2 ways, for example, as 1274490000 + 846577216 = 35700^2 + 29096^2 .

It is a super-2 number, since 2×2121067216² = 8997852269579981312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121067219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191295 + ... + 202078.

Almost surely, 2^2121067216 is an apocalyptic number.

It is an amenable number.

2121067216 is a deficient number, since it is larger than the sum of its proper divisors (2000705556).

2121067216 is a wasteful number, since it uses less digits than its factorization.

2121067216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393718 (or 393712 counting only the distinct ones).

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

The square root of 2121067216 is about 46055.0454999232. The cubic root of 2121067216 is about 1284.8471843589.

Adding to 2121067216 its reverse (6127601212), we get a palindrome (8248668428).

The spelling of 2121067216 in words is "two billion, one hundred twenty-one million, sixty-seven thousand, two hundred sixteen".