121000111212 has 48 divisors (see below), whose sum is σ = 299963028960. Its totient is φ = 37890058752.

The previous prime is 121000111189. The next prime is 121000111229. The reversal of 121000111212 is 212111000121.

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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4685793 + ... + 4711544.

It is an arithmetic number, because the mean of its divisors is an integer number (6249229770).

Almost surely, 2^121000111212 is an apocalyptic number.

121000111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121000111212 is an abundant number, since it is smaller than the sum of its proper divisors (178962917748).

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

121000111212 is a wasteful number, since it uses less digits than its factorization.

121000111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9397410 (or 9397408 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121000111212 its reverse (212111000121), we get a palindrome (333111111333).

The spelling of 121000111212 in words is "one hundred twenty-one billion, one hundred eleven thousand, two hundred twelve".