121100221021021 has 12 divisors (see below), whose sum is σ = 133111958039676. Its totient is φ = 110089623163520.

The previous prime is 121100221021007. The next prime is 121100221021027. The reversal of 121100221021021 is 120120122001121.

It can be written as a sum of positive squares in 2 ways, for example, as 24938388007225 + 96161833013796 = 4993835^2 + 9806214^2 .

It is not a de Polignac number, because 121100221021021 - 2⁷ = 121100221020893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121100221020986 and 121100221021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100221021027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2287605 + ... + 15730021.

It is an arithmetic number, because the mean of its divisors is an integer number (11092663169973).

Almost surely, 2^{121100221021021} is an apocalyptic number.

121100221021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121100221021021 is a deficient number, since it is larger than the sum of its proper divisors (12011737018655).

121100221021021 is a wasteful number, since it uses less digits than its factorization.

121100221021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13516892 (or 13516881 counting only the distinct ones).

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

Adding to 121100221021021 its reverse (120120122001121), we get a palindrome (241220343022142).

The spelling of 121100221021021 in words is "one hundred twenty-one trillion, one hundred billion, two hundred twenty-one million, twenty-one thousand, twenty-one".