2121280881 has 16 divisors (see below), whose sum is σ = 2859019200. Its totient is φ = 1398891200.

The previous prime is 2121280879. The next prime is 2121280933. The reversal of 2121280881 is 1880821212.

It is a cyclic number.

It is not a de Polignac number, because 2121280881 - 2¹ = 2121280879 is a prime.

It is a super-2 number, since 2×2121280881² = 8999665152192272322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121280841) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 413470 + ... + 418568.

It is an arithmetic number, because the mean of its divisors is an integer number (178688700).

Almost surely, 2^2121280881 is an apocalyptic number.

It is an amenable number.

2121280881 is a deficient number, since it is larger than the sum of its proper divisors (737738319).

2121280881 is a wasteful number, since it uses less digits than its factorization.

2121280881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6576.

The product of its (nonzero) digits is 4096, while the sum is 33.

The square root of 2121280881 is about 46057.3651113478. The cubic root of 2121280881 is about 1284.8903257948.

The spelling of 2121280881 in words is "two billion, one hundred twenty-one million, two hundred eighty thousand, eight hundred eighty-one".