4240023021 has 24 divisors (see below), whose sum is σ = 6882360576. Its totient is φ = 2495797920.

The previous prime is 4240023017. The next prime is 4240023031. The reversal of 4240023021 is 1203200424.

It is not a de Polignac number, because 4240023021 - 2² = 4240023017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4240022985 and 4240023003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4240023031) 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, 785125 + ... + 790506.

It is an arithmetic number, because the mean of its divisors is an integer number (286765024).

Almost surely, 2^4240023021 is an apocalyptic number.

It is an amenable number.

4240023021 is a deficient number, since it is larger than the sum of its proper divisors (2642337555).

4240023021 is a wasteful number, since it uses less digits than its factorization.

4240023021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1575673 (or 1575670 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 4240023021 is about 65115.4591552574. The cubic root of 4240023021 is about 1618.5373961754.

Adding to 4240023021 its reverse (1203200424), we get a palindrome (5443223445).

The spelling of 4240023021 in words is "four billion, two hundred forty million, twenty-three thousand, twenty-one".