121100021012021 has 4 divisors (see below), whose sum is σ = 121105339670700. Its totient is φ = 121094702353344.

The previous prime is 121100021012011. The next prime is 121100021012029. The reversal of 121100021012021 is 120210120001121.

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 45142085313796 + 75957935698225 = 6718786^2 + 8715385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121100021012021 is a prime.

It is a super-2 number, since 2×121100021012021² (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 = 121100021011987 and 121100021012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100021012029) 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, 2659295186 + ... + 2659340723.

It is an arithmetic number, because the mean of its divisors is an integer number (30276334917675).

Almost surely, 2^{121100021012021} is an apocalyptic number.

It is an amenable number.

121100021012021 is a deficient number, since it is larger than the sum of its proper divisors (5318658679).

121100021012021 is an equidigital number, since it uses as much as digits as its factorization.

121100021012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5318658678.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121100021012021 its reverse (120210120001121), we get a palindrome (241310141013142).

The spelling of 121100021012021 in words is "one hundred twenty-one trillion, one hundred billion, twenty-one million, twelve thousand, twenty-one".