10202220210121 has 4 divisors (see below), whose sum is σ = 10202469322644. Its totient is φ = 10201971097600.

The previous prime is 10202220210107. The next prime is 10202220210137. The reversal of 10202220210121 is 12101202220201.

It is a happy number.

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 8930749726096 + 1271470484025 = 2988436^2 + 1127595^2 .

It is a cyclic number.

It is not a de Polignac number, because 10202220210121 - 2¹¹ = 10202220208073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10202220210095 and 10202220210104.

It is not an unprimeable number, because it can be changed into a prime (10202220217121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124494820 + ... + 124576741.

It is an arithmetic number, because the mean of its divisors is an integer number (2550617330661).

Almost surely, 2^{10202220210121} is an apocalyptic number.

It is an amenable number.

10202220210121 is a deficient number, since it is larger than the sum of its proper divisors (249112523).

10202220210121 is an equidigital number, since it uses as much as digits as its factorization.

10202220210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249112522.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 10202220210121 its reverse (12101202220201), we get a palindrome (22303422430322).

The spelling of 10202220210121 in words is "ten trillion, two hundred two billion, two hundred twenty million, two hundred ten thousand, one hundred twenty-one".