10202012221 has 4 divisors (see below), whose sum is σ = 10207072252. Its totient is φ = 10196952192.

The previous prime is 10202012203. The next prime is 10202012243. The reversal of 10202012221 is 12221020201.

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 6787947321 + 3414064900 = 82389^2 + 58430^2 .

It is a cyclic number.

It is not a de Polignac number, because 10202012221 - 2⁹ = 10202011709 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 (10202012201) 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, 2526990 + ... + 2531023.

It is an arithmetic number, because the mean of its divisors is an integer number (2551768063).

Almost surely, 2^10202012221 is an apocalyptic number.

It is an amenable number.

10202012221 is a deficient number, since it is larger than the sum of its proper divisors (5060031).

10202012221 is an equidigital number, since it uses as much as digits as its factorization.

10202012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5060030.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 10202012221 its reverse (12221020201), we get a palindrome (22423032422).

The spelling of 10202012221 in words is "ten billion, two hundred two million, twelve thousand, two hundred twenty-one".