121103131111221 has 32 divisors (see below), whose sum is σ = 190586528677888. Its totient is φ = 66935870363520.

The previous prime is 121103131111219. The next prime is 121103131111247. The reversal of 121103131111221 is 122111131301121.

It is not a de Polignac number, because 121103131111221 - 2¹ = 121103131111219 is a prime.

It is a super-2 number, since 2×121103131111221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121103131111021) 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, 45372481 + ... + 47967366.

It is an arithmetic number, because the mean of its divisors is an integer number (5955829021184).

Almost surely, 2^{121103131111221} is an apocalyptic number.

It is an amenable number.

121103131111221 is a deficient number, since it is larger than the sum of its proper divisors (69483397566667).

121103131111221 is a wasteful number, since it uses less digits than its factorization.

121103131111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93341881.

The product of its (nonzero) digits is 72, while the sum is 21.

Adding to 121103131111221 its reverse (122111131301121), we get a palindrome (243214262412342).

The spelling of 121103131111221 in words is "one hundred twenty-one trillion, one hundred three billion, one hundred thirty-one million, one hundred eleven thousand, two hundred twenty-one".