10120011221 has 4 divisors (see below), whose sum is σ = 10136850444. Its totient is φ = 10103172000.

The previous prime is 10120011197. The next prime is 10120011233. The reversal of 10120011221 is 12211002101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12211002101 = 239 ⋅51092059.

It can be written as a sum of positive squares in 2 ways, for example, as 3398307025 + 6721704196 = 58295^2 + 81986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10120011221 is a prime.

It is a super-2 number, since 2×10120011221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10120011241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8418710 + ... + 8419911.

It is an arithmetic number, because the mean of its divisors is an integer number (2534212611).

Almost surely, 2^10120011221 is an apocalyptic number.

It is an amenable number.

10120011221 is a deficient number, since it is larger than the sum of its proper divisors (16839223).

10120011221 is an equidigital number, since it uses as much as digits as its factorization.

10120011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16839222.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10120011221 its reverse (12211002101), we get a palindrome (22331013322).

The spelling of 10120011221 in words is "ten billion, one hundred twenty million, eleven thousand, two hundred twenty-one".