999912121111102 has 4 divisors (see below), whose sum is σ = 1499868181666656. Its totient is φ = 499956060555550.

The previous prime is 999912121111073. The next prime is 999912121111121. The reversal of 999912121111102 is 201111121219999.

999912121111102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×999912121111102² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249978030277774 + ... + 249978030277777.

It is an arithmetic number, because the mean of its divisors is an integer number (374967045416664).

Almost surely, 2^{999912121111102} is an apocalyptic number.

999912121111102 is a deficient number, since it is larger than the sum of its proper divisors (499956060555554).

999912121111102 is a wasteful number, since it uses less digits than its factorization.

999912121111102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499956060555553.

The product of its (nonzero) digits is 52488, while the sum is 49.

The spelling of 999912121111102 in words is "nine hundred ninety-nine trillion, nine hundred twelve billion, one hundred twenty-one million, one hundred eleven thousand, one hundred two".