40020321021 has 4 divisors (see below), whose sum is σ = 53360428032. Its totient is φ = 26680214012.

The previous prime is 40020320999. The next prime is 40020321101. The reversal of 40020321021 is 12012302004.

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 a cyclic number.

It is not a de Polignac number, because 40020321021 - 2²⁶ = 39953212157 is a prime.

It is a super-3 number, since 3×40020321021³ (a number of 33 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40020321421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6670053501 + ... + 6670053506.

It is an arithmetic number, because the mean of its divisors is an integer number (13340107008).

Almost surely, 2^40020321021 is an apocalyptic number.

It is an amenable number.

40020321021 is a deficient number, since it is larger than the sum of its proper divisors (13340107011).

40020321021 is a wasteful number, since it uses less digits than its factorization.

40020321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13340107010.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 40020321021 its reverse (12012302004), we get a palindrome (52032623025).

The spelling of 40020321021 in words is "forty billion, twenty million, three hundred twenty-one thousand, twenty-one".