10120000021 has 4 divisors (see below), whose sum is σ = 10120768812. Its totient is φ = 10119231232.

The previous prime is 10120000019. The next prime is 10120000031. The reversal of 10120000021 is 12000002101.

10120000021 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 3111966225 + 7008033796 = 55785^2 + 83714^2 .

It is a cyclic number.

It is not a de Polignac number, because 10120000021 - 2¹ = 10120000019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10119999959 and 10120000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10120000031) 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, 364300 + ... + 391093.

It is an arithmetic number, because the mean of its divisors is an integer number (2530192203).

Almost surely, 2^10120000021 is an apocalyptic number.

It is an amenable number.

10120000021 is a deficient number, since it is larger than the sum of its proper divisors (768791).

10120000021 is an equidigital number, since it uses as much as digits as its factorization.

10120000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768790.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 10120000021 its reverse (12000002101), we get a palindrome (22120002122).

The spelling of 10120000021 in words is "ten billion, one hundred twenty million, twenty-one", and thus it is an aban number.