2123203021 has 4 divisors (see below), whose sum is σ = 2123431200. Its totient is φ = 2122974844.

The previous prime is 2123203009. The next prime is 2123203031. The reversal of 2123203021 is 1203023212.

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 2123203021 - 2¹¹ = 2123200973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123202986 and 2123203004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123203001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99511 + ... + 118948.

It is an arithmetic number, because the mean of its divisors is an integer number (530857800).

Almost surely, 2^2123203021 is an apocalyptic number.

It is an amenable number.

2123203021 is a deficient number, since it is larger than the sum of its proper divisors (228179).

2123203021 is an equidigital number, since it uses as much as digits as its factorization.

2123203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228178.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2123203021 is about 46078.2271902902. The cubic root of 2123203021 is about 1285.2782979121.

Adding to 2123203021 its reverse (1203023212), we get a palindrome (3326226233).

The spelling of 2123203021 in words is "two billion, one hundred twenty-three million, two hundred three thousand, twenty-one".