120010000021 has 2 divisors, whose sum is σ = 120010000022. Its totient is φ = 120010000020.

The previous prime is 120010000009. The next prime is 120010000031. The reversal of 120010000021 is 120000010021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117298715121 + 2711284900 = 342489^2 + 52070^2 .

It is an emirp because it is prime and its reverse (120000010021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120010000021 - 2²⁷ = 119875782293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 120009999959 and 120010000013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120010000031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60005000010 + 60005000011.

It is an arithmetic number, because the mean of its divisors is an integer number (60005000011).

Almost surely, 2^120010000021 is an apocalyptic number.

It is an amenable number.

120010000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

120010000021 is an equidigital number, since it uses as much as digits as its factorization.

120010000021 is an evil number, because the sum of its binary digits is even.

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

Adding to 120010000021 its reverse (120000010021), we get a palindrome (240010010042).

The spelling of 120010000021 in words is "one hundred twenty billion, ten million, twenty-one", and thus it is an aban number.