1991012200222 has 16 divisors (see below), whose sum is σ = 3031557930720. Its totient is φ = 980577951232.

The previous prime is 1991012200211. The next prime is 1991012200231. The reversal of 1991012200222 is 2220022101991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21218323 + ... + 21311950.

It is an arithmetic number, because the mean of its divisors is an integer number (189472370670).

Almost surely, 2^{1991012200222} is an apocalyptic number.

1991012200222 is a deficient number, since it is larger than the sum of its proper divisors (1040545730498).

1991012200222 is a wasteful number, since it uses less digits than its factorization.

1991012200222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42530627.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 1991012200222 in words is "one trillion, nine hundred ninety-one billion, twelve million, two hundred thousand, two hundred twenty-two".