10202010221 has 4 divisors (see below), whose sum is σ = 10986780252. Its totient is φ = 9417240192.

The previous prime is 10202010191. The next prime is 10202010263. The reversal of 10202010221 is 12201020201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12201020201 = 4603 ⋅2650667.

It can be written as a sum of positive squares in 2 ways, for example, as 1510177321 + 8691832900 = 38861^2 + 93230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10202010221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202010421) 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, 392384996 + ... + 392385021.

It is an arithmetic number, because the mean of its divisors is an integer number (2746695063).

Almost surely, 2^10202010221 is an apocalyptic number.

It is an amenable number.

10202010221 is a deficient number, since it is larger than the sum of its proper divisors (784770031).

10202010221 is an equidigital number, since it uses as much as digits as its factorization.

10202010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784770030.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 10202010221 its reverse (12201020201), we get a palindrome (22403030422).

The spelling of 10202010221 in words is "ten billion, two hundred two million, ten thousand, two hundred twenty-one".