111100121202121 has 4 divisors (see below), whose sum is σ = 112200122402244. Its totient is φ = 110000120002000.

The previous prime is 111100121202053. The next prime is 111100121202127. The reversal of 111100121202121 is 121202121001111.

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 83910821281225 + 27189299920896 = 9160285^2 + 5214336^2 .

It is a cyclic number.

It is not a de Polignac number, because 111100121202121 - 2²³ = 111100112813513 is a prime.

It is a super-2 number, since 2×111100121202121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111100121202095 and 111100121202104.

It is not an unprimeable number, because it can be changed into a prime (111100121202127) 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, 550000599910 + ... + 550000600111.

It is an arithmetic number, because the mean of its divisors is an integer number (28050030600561).

Almost surely, 2^{111100121202121} is an apocalyptic number.

It is an amenable number.

111100121202121 is a deficient number, since it is larger than the sum of its proper divisors (1100001200123).

111100121202121 is a wasteful number, since it uses less digits than its factorization.

111100121202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100001200122.

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

Adding to 111100121202121 its reverse (121202121001111), we get a palindrome (232302242203232).

The spelling of 111100121202121 in words is "one hundred eleven trillion, one hundred billion, one hundred twenty-one million, two hundred two thousand, one hundred twenty-one".