121211022200021 has 8 divisors (see below), whose sum is σ = 138213473278104. Its totient is φ = 105305503449600.

The previous prime is 121211022199999. The next prime is 121211022200087. The reversal of 121211022200021 is 120002220112121.

It can be written as a sum of positive squares in 4 ways, for example, as 7481893443025 + 113729128756996 = 2735305^2 + 10664386^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121211022200021 - 2²⁶ = 121210955091157 is a prime.

It is a super-3 number, since 3×121211022200021³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211022200321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274233081680 + ... + 274233082121.

It is an arithmetic number, because the mean of its divisors is an integer number (17276684159763).

Almost surely, 2^{121211022200021} is an apocalyptic number.

It is an amenable number.

121211022200021 is a deficient number, since it is larger than the sum of its proper divisors (17002451078083).

121211022200021 is a wasteful number, since it uses less digits than its factorization.

121211022200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548466163831.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121211022200021 its reverse (120002220112121), we get a palindrome (241213242312142).

The spelling of 121211022200021 in words is "one hundred twenty-one trillion, two hundred eleven billion, twenty-two million, two hundred thousand, twenty-one".