121121000111021 has 4 divisors (see below), whose sum is σ = 128245764823452. Its totient is φ = 113996235398592.

The previous prime is 121121000110993. The next prime is 121121000111063. The reversal of 121121000111021 is 120111000121121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74636830626121 + 46484169484900 = 8639261^2 + 6817930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121121000111021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121121000110987 and 121121000111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121000117021) 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, 3562382356190 + ... + 3562382356223.

It is an arithmetic number, because the mean of its divisors is an integer number (32061441205863).

Almost surely, 2^{121121000111021} is an apocalyptic number.

It is an amenable number.

121121000111021 is a deficient number, since it is larger than the sum of its proper divisors (7124764712431).

121121000111021 is an equidigital number, since it uses as much as digits as its factorization.

121121000111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7124764712430.

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

Adding to 121121000111021 its reverse (120111000121121), we get a palindrome (241232000232142).

The spelling of 121121000111021 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, one hundred eleven thousand, twenty-one".