40023021 has 4 divisors (see below), whose sum is σ = 53364032. Its totient is φ = 26682012.

The previous prime is 40023007. The next prime is 40023041. The reversal of 40023021 is 12032004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40023021 - 2⁹ = 40022509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40022988 and 40023006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40023041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6670501 + ... + 6670506.

It is an arithmetic number, because the mean of its divisors is an integer number (13341008).

Almost surely, 2^40023021 is an apocalyptic number.

It is an amenable number.

40023021 is a deficient number, since it is larger than the sum of its proper divisors (13341011).

40023021 is a wasteful number, since it uses less digits than its factorization.

40023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13341010.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 40023021 is about 6326.3750284029. The cubic root of 40023021 is about 342.0607856800.

Adding to 40023021 its reverse (12032004), we get a palindrome (52055025).

The spelling of 40023021 in words is "forty million, twenty-three thousand, twenty-one".