120002000021 has 4 divisors (see below), whose sum is σ = 122555234112. Its totient is φ = 117448765932.

The previous prime is 120002000017. The next prime is 120002000059. The reversal of 120002000021 is 120000200021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 120002000021 - 2² = 120002000017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120001999972 and 120002000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120002000011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1276616975 + ... + 1276617068.

It is an arithmetic number, because the mean of its divisors is an integer number (30638808528).

Almost surely, 2^120002000021 is an apocalyptic number.

It is an amenable number.

120002000021 is a deficient number, since it is larger than the sum of its proper divisors (2553234091).

120002000021 is an equidigital number, since it uses as much as digits as its factorization.

120002000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553234090.

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

Adding to 120002000021 its reverse (120000200021), we get a palindrome (240002200042).

The spelling of 120002000021 in words is "one hundred twenty billion, two million, twenty-one", and thus it is an aban number.