1212121100012 has 12 divisors (see below), whose sum is σ = 2121406804440. Its totient is φ = 606004870176.

The previous prime is 1212121099963. The next prime is 1212121100089. The reversal of 1212121100012 is 2100011212121.

It is a super-2 number, since 2×1212121100012² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1212121100012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13870958 + ... + 13958069.

It is an arithmetic number, because the mean of its divisors is an integer number (176783900370).

Almost surely, 2^{1212121100012} is an apocalyptic number.

It is an amenable number.

1212121100012 is a deficient number, since it is larger than the sum of its proper divisors (909285704428).

1212121100012 is a wasteful number, since it uses less digits than its factorization.

1212121100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27839920 (or 27839918 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1212121100012 its reverse (2100011212121), we get a palindrome (3312132312133).

The spelling of 1212121100012 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, one hundred thousand, twelve".