21123167228 has 12 divisors (see below), whose sum is σ = 37005339840. Its totient is φ = 10550212992.

The previous prime is 21123167213. The next prime is 21123167279. The reversal of 21123167228 is 82276132112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2838476 + ... + 2845907.

It is an arithmetic number, because the mean of its divisors is an integer number (3083778320).

Almost surely, 2^21123167228 is an apocalyptic number.

It is an amenable number.

21123167228 is a deficient number, since it is larger than the sum of its proper divisors (15882172612).

21123167228 is a wasteful number, since it uses less digits than its factorization.

21123167228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5685316 (or 5685314 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The spelling of 21123167228 in words is "twenty-one billion, one hundred twenty-three million, one hundred sixty-seven thousand, two hundred twenty-eight".