2123331021 has 24 divisors (see below), whose sum is σ = 3506979840. Its totient is φ = 1212709536.

The previous prime is 2123330977. The next prime is 2123331029. The reversal of 2123331021 is 1201333212.

It is not a de Polignac number, because 2123331021 - 2⁷ = 2123330893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2123330985 and 2123331003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123331029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133531 + ... + 148583.

It is an arithmetic number, because the mean of its divisors is an integer number (146124160).

Almost surely, 2^2123331021 is an apocalyptic number.

2123331021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2123331021 is a deficient number, since it is larger than the sum of its proper divisors (1383648819).

2123331021 is a wasteful number, since it uses less digits than its factorization.

2123331021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17305 (or 17302 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 2123331021 is about 46079.6161116822. The cubic root of 2123331021 is about 1285.3041256065.

Adding to 2123331021 its reverse (1201333212), we get a palindrome (3324664233).

The spelling of 2123331021 in words is "two billion, one hundred twenty-three million, three hundred thirty-one thousand, twenty-one".