2112321021 has 4 divisors (see below), whose sum is σ = 2816428032. Its totient is φ = 1408214012.

The previous prime is 2112321011. The next prime is 2112321089. The reversal of 2112321021 is 1201232112.

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 2112321021 - 2¹⁷ = 2112189949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112321011) 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, 352053501 + ... + 352053506.

It is an arithmetic number, because the mean of its divisors is an integer number (704107008).

Almost surely, 2^2112321021 is an apocalyptic number.

It is an amenable number.

2112321021 is a deficient number, since it is larger than the sum of its proper divisors (704107011).

2112321021 is an equidigital number, since it uses as much as digits as its factorization.

2112321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704107010.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2112321021 is about 45959.9937010440. The cubic root of 2112321021 is about 1283.0787341266.

Adding to 2112321021 its reverse (1201232112), we get a palindrome (3313553133).

It can be divided in two parts, 211 and 2321021, that added together give a palindrome (2321232).

The spelling of 2112321021 in words is "two billion, one hundred twelve million, three hundred twenty-one thousand, twenty-one".