1212123020011 has 32 divisors (see below), whose sum is σ = 1273931366400. Its totient is φ = 1151948304000.

The previous prime is 1212123019997. The next prime is 1212123020021. The reversal of 1212123020011 is 1100203212121.

It is a cyclic number.

It is not a de Polignac number, because 1212123020011 - 2¹⁷ = 1212122888939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212123020021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 566147001 + ... + 566149141.

It is an arithmetic number, because the mean of its divisors is an integer number (39810355200).

Almost surely, 2^{1212123020011} is an apocalyptic number.

1212123020011 is a deficient number, since it is larger than the sum of its proper divisors (61808346389).

1212123020011 is a wasteful number, since it uses less digits than its factorization.

1212123020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3691.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1212123020011 its reverse (1100203212121), we get a palindrome (2312326232132).

The spelling of 1212123020011 in words is "one trillion, two hundred twelve billion, one hundred twenty-three million, twenty thousand, eleven".