10201221221 has 4 divisors (see below), whose sum is σ = 10552987500. Its totient is φ = 9849454944.

The previous prime is 10201221203. The next prime is 10201221223. The reversal of 10201221221 is 12212210201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12212210201 = 1409 ⋅8667289.

It can be written as a sum of positive squares in 2 ways, for example, as 8370237121 + 1830984100 = 91489^2 + 42790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10201221221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10201221196 and 10201221205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10201221223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175883096 + ... + 175883153.

It is an arithmetic number, because the mean of its divisors is an integer number (2638246875).

Almost surely, 2^10201221221 is an apocalyptic number.

It is an amenable number.

10201221221 is a deficient number, since it is larger than the sum of its proper divisors (351766279).

10201221221 is an equidigital number, since it uses as much as digits as its factorization.

10201221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351766278.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10201221221 its reverse (12212210201), we get a palindrome (22413431422).

The spelling of 10201221221 in words is "ten billion, two hundred one million, two hundred twenty-one thousand, two hundred twenty-one".