40331021 has 4 divisors (see below), whose sum is σ = 42703452. Its totient is φ = 37958592.

The previous prime is 40330993. The next prime is 40331023. The reversal of 40331021 is 12013304.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21058921 + 19272100 = 4589^2 + 4390^2 .

It is a cyclic number.

It is not a de Polignac number, because 40331021 - 2⁶ = 40330957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40330987 and 40331005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40331023) 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, 1186190 + ... + 1186223.

It is an arithmetic number, because the mean of its divisors is an integer number (10675863).

Almost surely, 2^40331021 is an apocalyptic number.

It is an amenable number.

40331021 is a deficient number, since it is larger than the sum of its proper divisors (2372431).

40331021 is a wasteful number, since it uses less digits than its factorization.

40331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372430.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 40331021 is about 6350.6709094394. The cubic root of 40331021 is about 342.9359954466.

Adding to 40331021 its reverse (12013304), we get a palindrome (52344325).

The spelling of 40331021 in words is "forty million, three hundred thirty-one thousand, twenty-one".