2123321021 has 4 divisors (see below), whose sum is σ = 2168498112. Its totient is φ = 2078143932.

The previous prime is 2123321017. The next prime is 2123321059. The reversal of 2123321021 is 1201233212.

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 2123321021 - 2² = 2123321017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123321621) 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, 22588475 + ... + 22588568.

It is an arithmetic number, because the mean of its divisors is an integer number (542124528).

Almost surely, 2^2123321021 is an apocalyptic number.

It is an amenable number.

2123321021 is a deficient number, since it is larger than the sum of its proper divisors (45177091).

2123321021 is an equidigital number, since it uses as much as digits as its factorization.

2123321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45177090.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2123321021 is about 46079.5076037060. The cubic root of 2123321021 is about 1285.3021078552.

Adding to 2123321021 its reverse (1201233212), we get a palindrome (3324554233).

It can be divided in two parts, 212 and 3321021, that added together give a palindrome (3321233).

The spelling of 2123321021 in words is "two billion, one hundred twenty-three million, three hundred twenty-one thousand, twenty-one".