2121656674 has 16 divisors (see below), whose sum is σ = 3244545720. Its totient is φ = 1040166400.

The previous prime is 2121656659. The next prime is 2121656681. The reversal of 2121656674 is 4766561212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1861318449 + 260338225 = 43143^2 + 16135^2 .

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 7 ways as a sum of consecutive naturals, for example, 196242 + ... + 206770.

Almost surely, 2^2121656674 is an apocalyptic number.

2121656674 is a deficient number, since it is larger than the sum of its proper divisors (1122889046).

2121656674 is a wasteful number, since it uses less digits than its factorization.

2121656674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12485.

The product of its digits is 120960, while the sum is 40.

The square root of 2121656674 is about 46061.4445496448. Note that the first 3 decimals coincide. The cubic root of 2121656674 is about 1284.9661957223.

The spelling of 2121656674 in words is "two billion, one hundred twenty-one million, six hundred fifty-six thousand, six hundred seventy-four".