10012122221 has 4 divisors (see below), whose sum is σ = 10012504572. Its totient is φ = 10011739872.

The previous prime is 10012122217. The next prime is 10012122277. The reversal of 10012122221 is 12222121001.

10012122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1569268996 + 8442853225 = 39614^2 + 91885^2 .

It is a cyclic number.

It is not a de Polignac number, because 10012122221 - 2² = 10012122217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10012122196 and 10012122205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10512122221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148760 + ... + 205313.

It is an arithmetic number, because the mean of its divisors is an integer number (2503126143).

Almost surely, 2^10012122221 is an apocalyptic number.

It is an amenable number.

10012122221 is a deficient number, since it is larger than the sum of its proper divisors (382351).

10012122221 is an equidigital number, since it uses as much as digits as its factorization.

10012122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382350.

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

Adding to 10012122221 its reverse (12222121001), we get a palindrome (22234243222).

The spelling of 10012122221 in words is "ten billion, twelve million, one hundred twenty-two thousand, two hundred twenty-one".