2129222821 has 16 divisors (see below), whose sum is σ = 2474519040. Its totient is φ = 1811671920.

The previous prime is 2129222819. The next prime is 2129222827. The reversal of 2129222821 is 1282229212.

It is a cyclic number.

It is not a de Polignac number, because 2129222821 - 2¹ = 2129222819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129222827) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 44025 + ... + 78718.

It is an arithmetic number, because the mean of its divisors is an integer number (154657440).

Almost surely, 2^2129222821 is an apocalyptic number.

It is an amenable number.

2129222821 is a deficient number, since it is larger than the sum of its proper divisors (345296219).

2129222821 is a wasteful number, since it uses less digits than its factorization.

2129222821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122856.

The product of its digits is 4608, while the sum is 31.

The square root of 2129222821 is about 46143.5024786806. The cubic root of 2129222821 is about 1286.4918445379.

The spelling of 2129222821 in words is "two billion, one hundred twenty-nine million, two hundred twenty-two thousand, eight hundred twenty-one".