189628221123 has 64 divisors (see below), whose sum is σ = 308547532800. Its totient is φ = 114148651680.

The previous prime is 189628221089. The next prime is 189628221137. The reversal of 189628221123 is 321122826981.

189628221123 is a `hidden beast` number, since 1 + 8 + 9 + 628 + 2 + 2 + 1 + 12 + 3 = 666.

It is not a de Polignac number, because 189628221123 - 2⁸ = 189628220867 is a prime.

It is a super-2 number, since 2×189628221123² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189628221193) 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 63 ways as a sum of consecutive naturals, for example, 61827036 + ... + 61830102.

It is an arithmetic number, because the mean of its divisors is an integer number (4821055200).

Almost surely, 2^189628221123 is an apocalyptic number.

189628221123 is a deficient number, since it is larger than the sum of its proper divisors (118919311677).

189628221123 is a wasteful number, since it uses less digits than its factorization.

189628221123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4429 (or 4423 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The spelling of 189628221123 in words is "one hundred eighty-nine billion, six hundred twenty-eight million, two hundred twenty-one thousand, one hundred twenty-three".