10221210012121 has 4 divisors (see below), whose sum is σ = 10225576187044. Its totient is φ = 10216843837200.

The previous prime is 10221210012089. The next prime is 10221210012127. The reversal of 10221210012121 is 12121001212201.

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 7304506209225 + 2916703802896 = 2702685^2 + 1707836^2 .

It is a cyclic number.

It is not a de Polignac number, because 10221210012121 - 2⁵ = 10221210012089 is a prime.

It is a super-2 number, since 2×10221210012121² (a number of 27 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 = 10221210012095 and 10221210012104.

It is not an unprimeable number, because it can be changed into a prime (10221210012127) 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, 2183083950 + ... + 2183088631.

It is an arithmetic number, because the mean of its divisors is an integer number (2556394046761).

Almost surely, 2^{10221210012121} is an apocalyptic number.

It is an amenable number.

10221210012121 is a deficient number, since it is larger than the sum of its proper divisors (4366174923).

10221210012121 is an equidigital number, since it uses as much as digits as its factorization.

10221210012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366174922.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 10221210012121 its reverse (12121001212201), we get a palindrome (22342211224322).

The spelling of 10221210012121 in words is "ten trillion, two hundred twenty-one billion, two hundred ten million, twelve thousand, one hundred twenty-one".