4023123021 has 12 divisors (see below), whose sum is σ = 5841289948. Its totient is φ = 2668184064.

The previous prime is 4023123017. The next prime is 4023123031. The reversal of 4023123021 is 1203213204.

4023123021 is a `hidden beast` number, since 402 + 31 + 230 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1187560521 + 2835562500 = 34461^2 + 53250^2 .

It is not a de Polignac number, because 4023123021 - 2² = 4023123017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4023122985 and 4023123003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4023123031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1156330 + ... + 1159803.

Almost surely, 2^4023123021 is an apocalyptic number.

It is an amenable number.

4023123021 is a deficient number, since it is larger than the sum of its proper divisors (1818166927).

4023123021 is a wasteful number, since it uses less digits than its factorization.

4023123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316332 (or 2316329 counting only the distinct ones).

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

The square root of 4023123021 is about 63428.0933104567. The cubic root of 4023123021 is about 1590.4539691029.

Adding to 4023123021 its reverse (1203213204), we get a palindrome (5226336225).

The spelling of 4023123021 in words is "four billion, twenty-three million, one hundred twenty-three thousand, twenty-one".