4023040021 has 64 divisors (see below), whose sum is σ = 5817692160. Its totient is φ = 2676648960.

The previous prime is 4023039997. The next prime is 4023040027. The reversal of 4023040021 is 1200403204.

It is a cyclic number.

It is not a de Polignac number, because 4023040021 - 2⁵ = 4023039989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4023039977 and 4023040004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4023040027) 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, 1002000 + ... + 1006006.

It is an arithmetic number, because the mean of its divisors is an integer number (90901440).

Almost surely, 2^4023040021 is an apocalyptic number.

It is an amenable number.

4023040021 is a deficient number, since it is larger than the sum of its proper divisors (1794652139).

4023040021 is a wasteful number, since it uses less digits than its factorization.

4023040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4114.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 4023040021 is about 63427.4390228709. The cubic root of 4023040021 is about 1590.4430316142.

Adding to 4023040021 its reverse (1200403204), we get a palindrome (5223443225).

The spelling of 4023040021 in words is "four billion, twenty-three million, forty thousand, twenty-one".