121200002101021 has 4 divisors (see below), whose sum is σ = 121720173784092. Its totient is φ = 120679830417952.

The previous prime is 121200002100973. The next prime is 121200002101097. The reversal of 121200002101021 is 120101200002121.

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 35049490308121 + 86150511792900 = 5920261^2 + 9281730^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200002101021 - 2²⁷ = 121199867883293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121200002100992 and 121200002101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200002101121) 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, 260085841186 + ... + 260085841651.

It is an arithmetic number, because the mean of its divisors is an integer number (30430043446023).

Almost surely, 2^{121200002101021} is an apocalyptic number.

It is an amenable number.

121200002101021 is a deficient number, since it is larger than the sum of its proper divisors (520171683071).

121200002101021 is an equidigital number, since it uses as much as digits as its factorization.

121200002101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520171683070.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121200002101021 its reverse (120101200002121), we get a palindrome (241301202103142).

The spelling of 121200002101021 in words is "one hundred twenty-one trillion, two hundred billion, two million, one hundred one thousand, twenty-one".