121111011012 has 24 divisors (see below), whose sum is σ = 282601552576. Its totient is φ = 40369023648.

The previous prime is 121111011001. The next prime is 121111011031. The reversal of 121111011012 is 210110111121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264918 + ... + 558930.

Almost surely, 2^121111011012 is an apocalyptic number.

121111011012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121111011012 is an abundant number, since it is smaller than the sum of its proper divisors (161490541564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121111011012 is a wasteful number, since it uses less digits than its factorization.

121111011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328347 (or 328345 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121111011012 its reverse (210110111121), we get a palindrome (331221122133).

The spelling of 121111011012 in words is "one hundred twenty-one billion, one hundred eleven million, eleven thousand, twelve".