10120211121221 has 4 divisors (see below), whose sum is σ = 10154751091212. Its totient is φ = 10085671151232.

The previous prime is 10120211121217. The next prime is 10120211121233. The reversal of 10120211121221 is 12212111202101.

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 9257840728900 + 862370392321 = 3042670^2 + 928639^2 .

It is a cyclic number.

It is not a de Polignac number, because 10120211121221 - 2² = 10120211121217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10120211121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10120291121221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17269984556 + ... + 17269985141.

It is an arithmetic number, because the mean of its divisors is an integer number (2538687772803).

Almost surely, 2^{10120211121221} is an apocalyptic number.

It is an amenable number.

10120211121221 is a deficient number, since it is larger than the sum of its proper divisors (34539969991).

10120211121221 is an equidigital number, since it uses as much as digits as its factorization.

10120211121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34539969990.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 10120211121221 its reverse (12212111202101), we get a palindrome (22332322323322).

The spelling of 10120211121221 in words is "ten trillion, one hundred twenty billion, two hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".