1221222100111 has 8 divisors (see below), whose sum is σ = 1320806738160. Its totient is φ = 1122443815872.

The previous prime is 1221222100093. The next prime is 1221222100243. The reversal of 1221222100111 is 1110012221221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221222100111 - 2⁵ = 1221222100079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221222100411) 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 7 ways as a sum of consecutive naturals, for example, 201585301 + ... + 201591358.

It is an arithmetic number, because the mean of its divisors is an integer number (165100842270).

Almost surely, 2^{1221222100111} is an apocalyptic number.

1221222100111 is a deficient number, since it is larger than the sum of its proper divisors (99584638049).

1221222100111 is a wasteful number, since it uses less digits than its factorization.

1221222100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403176905.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221222100111 its reverse (1110012221221), we get a palindrome (2331234321332).

The spelling of 1221222100111 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, one hundred eleven".