2112320021 has 4 divisors (see below), whose sum is σ = 2414080032. Its totient is φ = 1810560012.

The previous prime is 2112319987. The next prime is 2112320027. The reversal of 2112320021 is 1200232112.

It is a happy number.

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 2112320021 - 2¹⁰ = 2112318997 is a prime.

It is a super-2 number, since 2×2112320021² = 8923791742234880882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2112319978 and 2112320005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112320027) 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, 150879995 + ... + 150880008.

It is an arithmetic number, because the mean of its divisors is an integer number (603520008).

Almost surely, 2^2112320021 is an apocalyptic number.

It is an amenable number.

2112320021 is a deficient number, since it is larger than the sum of its proper divisors (301760011).

2112320021 is an equidigital number, since it uses as much as digits as its factorization.

2112320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301760010.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2112320021 is about 45959.9828220159. The cubic root of 2112320021 is about 1283.0785316513.

Adding to 2112320021 its reverse (1200232112), we get a palindrome (3312552133).

It can be divided in two parts, 211 and 2320021, that added together give a palindrome (2320232).

The spelling of 2112320021 in words is "two billion, one hundred twelve million, three hundred twenty thousand, twenty-one".