10000012221 has 20 divisors (see below), whose sum is σ = 15817014972. Its totient is φ = 6274516608.

The previous prime is 10000012181. The next prime is 10000012223. The reversal of 10000012221 is 12221000001.

It can be written as a sum of positive squares in 2 ways, for example, as 2705144121 + 7294868100 = 52011^2 + 85410^2 .

It is not a de Polignac number, because 10000012221 - 2⁶ = 10000012157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000012223) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3629710 + ... + 3632463.

Almost surely, 2^10000012221 is an apocalyptic number.

It is an amenable number.

10000012221 is a deficient number, since it is larger than the sum of its proper divisors (5817002751).

10000012221 is an equidigital number, since it uses as much as digits as its factorization.

10000012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7262202 (or 7262193 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10000012221 its reverse (12221000001), we get a palindrome (22221012222).

The spelling of 10000012221 in words is "ten billion, twelve thousand, two hundred twenty-one".