1201221111111 has 32 divisors (see below), whose sum is σ = 1873730242560. Its totient is φ = 670187728224.

The previous prime is 1201221111061. The next prime is 1201221111161. The reversal of 1201221111111 is 1111111221021.

It is an interprime number because it is at equal distance from previous prime (1201221111061) and next prime (1201221111161).

It is not a de Polignac number, because 1201221111111 - 2⁷ = 1201221110983 is a prime.

1201221111111 is a modest number, since divided by 1111111 gives 120122 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201221111161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2070936 + ... + 2586738.

It is an arithmetic number, because the mean of its divisors is an integer number (58554070080).

Almost surely, 2^{1201221111111} is an apocalyptic number.

1201221111111 is a deficient number, since it is larger than the sum of its proper divisors (672509131449).

1201221111111 is a wasteful number, since it uses less digits than its factorization.

1201221111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518435.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1201221111111 its reverse (1111111221021), we get a palindrome (2312332332132).

The spelling of 1201221111111 in words is "one trillion, two hundred one billion, two hundred twenty-one million, one hundred eleven thousand, one hundred eleven".