40321123021 has 8 divisors (see below), whose sum is σ = 40471371000. Its totient is φ = 40170923520.

The previous prime is 40321123013. The next prime is 40321123027. The reversal of 40321123021 is 12032112304.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9137448100 + 31183674921 = 95590^2 + 176589^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40321123021 - 2³ = 40321123013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40321123021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40321123027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3340405 + ... + 3352453.

It is an arithmetic number, because the mean of its divisors is an integer number (5058921375).

Almost surely, 2^40321123021 is an apocalyptic number.

It is an amenable number.

40321123021 is a deficient number, since it is larger than the sum of its proper divisors (150247979).

40321123021 is a wasteful number, since it uses less digits than its factorization.

40321123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24239.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 40321123021 its reverse (12032112304), we get a palindrome (52353235325).

The spelling of 40321123021 in words is "forty billion, three hundred twenty-one million, one hundred twenty-three thousand, twenty-one".