189991989122 has 32 divisors (see below), whose sum is σ = 308400637440. Its totient is φ = 87263049600.

The previous prime is 189991989053. The next prime is 189991989127. The reversal of 189991989122 is 221989199981.

It is not an unprimeable number, because it can be changed into a prime (189991989127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23483654 + ... + 23491742.

It is an arithmetic number, because the mean of its divisors is an integer number (9637519920).

Almost surely, 2^189991989122 is an apocalyptic number.

189991989122 is a deficient number, since it is larger than the sum of its proper divisors (118408648318).

189991989122 is a wasteful number, since it uses less digits than its factorization.

189991989122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12378.

The product of its digits is 15116544, while the sum is 68.

The spelling of 189991989122 in words is "one hundred eighty-nine billion, nine hundred ninety-one million, nine hundred eighty-nine thousand, one hundred twenty-two".