40405215521 has 24 divisors (see below), whose sum is σ = 45488604672. Its totient is φ = 35849184800.

The previous prime is 40405215517. The next prime is 40405215593. The reversal of 40405215521 is 12551250404.

It is not a de Polignac number, because 40405215521 - 2² = 40405215517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40405212521) 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, 1208390 + ... + 1241376.

It is an arithmetic number, because the mean of its divisors is an integer number (1895358528).

Almost surely, 2^40405215521 is an apocalyptic number.

It is an amenable number.

40405215521 is a deficient number, since it is larger than the sum of its proper divisors (5083389151).

40405215521 is a wasteful number, since it uses less digits than its factorization.

40405215521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33253 (or 33242 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 40405215521 its reverse (12551250404), we get a palindrome (52956465925).

The spelling of 40405215521 in words is "forty billion, four hundred five million, two hundred fifteen thousand, five hundred twenty-one".