1221222001011 has 16 divisors (see below), whose sum is σ = 1650646041216. Its totient is φ = 802973583936.

The previous prime is 1221222000961. The next prime is 1221222001033. The reversal of 1221222001011 is 1101002221221.

It is not a de Polignac number, because 1221222001011 - 2¹⁵ = 1221221968243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221222001061) 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 15 ways as a sum of consecutive naturals, for example, 14236696 + ... + 14322218.

It is an arithmetic number, because the mean of its divisors is an integer number (103165377576).

Almost surely, 2^{1221222001011} is an apocalyptic number.

1221222001011 is a deficient number, since it is larger than the sum of its proper divisors (429424040205).

1221222001011 is an equidigital number, since it uses as much as digits as its factorization.

1221222001011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150802.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221222001011 its reverse (1101002221221), we get a palindrome (2322224222232).

The spelling of 1221222001011 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one thousand, eleven".