121221111103 has 8 divisors (see below), whose sum is σ = 123076795680. Its totient is φ = 119369547360.

The previous prime is 121221111097. The next prime is 121221111127. The reversal of 121221111103 is 301111122121.

It is a happy number.

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 121221111103 - 2¹⁷ = 121220980031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221111163) 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 7 ways as a sum of consecutive naturals, for example, 970900 + ... + 1088617.

It is an arithmetic number, because the mean of its divisors is an integer number (15384599460).

Almost surely, 2^121221111103 is an apocalyptic number.

121221111103 is a deficient number, since it is larger than the sum of its proper divisors (1855684577).

121221111103 is an equidigital number, since it uses as much as digits as its factorization.

121221111103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2060417.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 121221111103 its reverse (301111122121), we get a palindrome (422332233224).

It can be divided in two parts, 121221 and 111103, that added together give a square (232324 = 482²).

The spelling of 121221111103 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, one hundred three".