121100111001221 has 4 divisors (see below), whose sum is σ = 132109212001344. Its totient is φ = 110091010001100.

The previous prime is 121100111001209. The next prime is 121100111001241. The reversal of 121100111001221 is 122100111001121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121100111001221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121100111001196 and 121100111001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100111001241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5504550500045 + ... + 5504550500066.

It is an arithmetic number, because the mean of its divisors is an integer number (33027303000336).

Almost surely, 2^{121100111001221} is an apocalyptic number.

121100111001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121100111001221 is a deficient number, since it is larger than the sum of its proper divisors (11009101000123).

121100111001221 is a wasteful number, since it uses less digits than its factorization.

121100111001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11009101000122.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121100111001221 its reverse (122100111001121), we get a palindrome (243200222002342).

The spelling of 121100111001221 in words is "one hundred twenty-one trillion, one hundred billion, one hundred eleven million, one thousand, two hundred twenty-one".