2021223123 has 6 divisors (see below), whose sum is σ = 2919544524. Its totient is φ = 1347482076.

The previous prime is 2021223107. The next prime is 2021223131. The reversal of 2021223123 is 3213221202.

It is not a de Polignac number, because 2021223123 - 2⁴ = 2021223107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021223096 and 2021223105.

It is not an unprimeable number, because it can be changed into a prime (2021223623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112290165 + ... + 112290182.

It is an arithmetic number, because the mean of its divisors is an integer number (486590754).

Almost surely, 2^2021223123 is an apocalyptic number.

2021223123 is a deficient number, since it is larger than the sum of its proper divisors (898321401).

2021223123 is a wasteful number, since it uses less digits than its factorization.

2021223123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224580353 (or 224580350 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2021223123 is about 44958.0151141040. The cubic root of 2021223123 is about 1264.3619549980.

Adding to 2021223123 its reverse (3213221202), we get a palindrome (5234444325).

The spelling of 2021223123 in words is "two billion, twenty-one million, two hundred twenty-three thousand, one hundred twenty-three".