2123310021 has 64 divisors (see below), whose sum is σ = 3613102080. Its totient is φ = 1081175040.

The previous prime is 2123310017. The next prime is 2123310031. The reversal of 2123310021 is 1200133212.

It is not a de Polignac number, because 2123310021 - 2² = 2123310017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123310011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 557901 + ... + 561693.

It is an arithmetic number, because the mean of its divisors is an integer number (56454720).

Almost surely, 2^2123310021 is an apocalyptic number.

2123310021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2123310021 is a deficient number, since it is larger than the sum of its proper divisors (1489792059).

2123310021 is a wasteful number, since it uses less digits than its factorization.

2123310021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3906.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2123310021 is about 46079.3882446371. The cubic root of 2123310021 is about 1285.2998883216.

Adding to 2123310021 its reverse (1200133212), we get a palindrome (3323443233).

The spelling of 2123310021 in words is "two billion, one hundred twenty-three million, three hundred ten thousand, twenty-one".