1212122221011 has 128 divisors (see below), whose sum is σ = 2068685337600. Its totient is φ = 695222922240.

The previous prime is 1212122220979. The next prime is 1212122221019. The reversal of 1212122221011 is 1101222212121.

It is not a de Polignac number, because 1212122221011 - 2⁵ = 1212122220979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212122221019) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 527696815 + ... + 527699111.

It is an arithmetic number, because the mean of its divisors is an integer number (16161604200).

Almost surely, 2^{1212122221011} is an apocalyptic number.

1212122221011 is a deficient number, since it is larger than the sum of its proper divisors (856563116589).

1212122221011 is a wasteful number, since it uses less digits than its factorization.

1212122221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3586 (or 3580 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212122221011 its reverse (1101222212121), we get a palindrome (2313344433132).

The spelling of 1212122221011 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twenty-one thousand, eleven".