111220001221 has 48 divisors (see below), whose sum is σ = 141294561408. Its totient is φ = 85454899200.

The previous prime is 111220001203. The next prime is 111220001227. The reversal of 111220001221 is 122100022111.

It is not a de Polignac number, because 111220001221 - 2⁷ = 111220001093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220001227) 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 47 ways as a sum of consecutive naturals, for example, 15167526 + ... + 15174856.

It is an arithmetic number, because the mean of its divisors is an integer number (2943636696).

Almost surely, 2^111220001221 is an apocalyptic number.

It is an amenable number.

111220001221 is a deficient number, since it is larger than the sum of its proper divisors (30074560187).

111220001221 is a wasteful number, since it uses less digits than its factorization.

111220001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7642 (or 7619 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111220001221 its reverse (122100022111), we get a palindrome (233320023332).

The spelling of 111220001221 in words is "one hundred eleven billion, two hundred twenty million, one thousand, two hundred twenty-one".